[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2019-07-24 Thread Brad Figg 
** Tags added: cscc

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2019-01-19 Thread Joseph Salisbury 
** Changed in: linux (Ubuntu)
   Status: In Progress => Fix Released

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-11-20 Thread Manoj Iyer 
** Changed in: ubuntu-power-systems
   Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-11-06 Thread Manoj Iyer 
** Changed in: ubuntu-power-systems
   Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-10-30 Thread bugproxy 
--- Comment From jhop...@us.ibm.com 2017-10-30 16:55 EDT---
Thanks, I verified the fix in -proposed dramatically reduces unnecessary 
migrations as expected and improves performance using an underutilized ebizzy 
testcase.

with previous kernel:
4.10.0-34-generic
5,640  sched:sched_migrate_task

with -proposed kernel:
4.10.0-38-generic
516  sched:sched_migrate_task

testcase was run on a 32core system:
# perf stat -a -r 5 -e sched:sched_migrate_task ./ebizzy -t 35 -S 100

** Tags removed: verification-needed-zesty
** Tags added: verification-done-zesty

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-10-30 Thread Launchpad Bug Tracker 
This bug was fixed in the package linux - 4.10.0-38.42

---
linux (4.10.0-38.42) zesty; urgency=low

  * linux: 4.10.0-38.42 -proposed tracker (LP: #1722330)

  * Controller lockup detected on ProLiant DL380 Gen9 with P440 Controller
(LP: #1720359)
- scsi: hpsa: limit transfer length to 1MB

  * [Dell Docking IE][0bda:8153] Realtek USB Ethernet leads to system hang
(LP: #1720977)
- r8152: fix the list rx_done may be used without initialization

  * Touchpad not detected in Lenovo X1 Yoga / Yoga 720-15IKB (LP: #1700657)
- mfd: intel-lpss: Add missing PCI ID for Intel Sunrise Point LPSS devices

  * Add installer support for Broadcom BCM573xx network drivers. (LP: #1720466)
- d-i: Add bnxt_en to nic-modules.

  * CVE-2017-1000252
- KVM: VMX: Do not BUG() on out-of-bounds guest IRQ

  * CVE-2017-10663
- f2fs: sanity check checkpoint segno and blkoff

  * xfstest sanity checks on seek operations fails (LP: #1696049)
- xfs: fix off-by-one on max nr_pages in xfs_find_get_desired_pgoff()

  * [P9, Power NV][ WSP][Ubuntu 16.04.03] : perf hw breakpoint command results
in call traces and system goes for reboot. (LP: #1706033)
- powerpc/64s: Handle data breakpoints in Radix mode

  * 5U84 - ses driver isn't binding right - cannot blink lights on 1 of the 2
5u84 (LP: #1693369)
- scsi: ses: do not add a device to an enclosure if enclosure_add_links()
  fails.

  * Vlun resize request could fail with cxlflash driver (LP: #1713575)
- scsi: cxlflash: Fix vlun resize failure in the shrink path

  * More migrations with constant load (LP: #1713576)
- sched/fair: Prefer sibiling only if local group is under-utilized

  * New PMU fixes for marked events. (LP: #1716491)
- powerpc/perf: POWER9 PMU stops after idle workaround

  * CVE-2017-14340
- xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present

  * [Zesty][Yakkety] rtl8192e bug fixes (LP: #1698470)
- staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.
- staging: rtl8192e: fix 2 byte alignment of register BSSIDR.
- staging: rtl8192e: rtl92e_get_eeprom_size Fix read size of EPROM_CMD.
- staging: rtl8192e: GetTs Fix invalid TID 7 warning.

  * Stranded with ENODEV after mdadm --readonly (LP: #1706243)
- md: MD_CLOSING needs to be cleared after called md_set_readonly or
  do_md_stop

  * multipath -ll is not showing the disks which are actually multipath
(LP: #1718397)
- fs: aio: fix the increment of aio-nr and counting against aio-max-nr

  * ETPS/2 Elantech Touchpad inconsistently detected (Gigabyte P57W laptop)
(LP: #1594214)
- Input: i8042 - add Gigabyte P57 to the keyboard reset table

  * CVE-2017-10911
- xen-blkback: don't leak stack data via response ring

  * CVE-2017-11176
- mqueue: fix a use-after-free in sys_mq_notify()

  * implement 'complain mode' in seccomp for developer mode with snaps
(LP: #1567597)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Action to log before allowing

  * implement errno action logging in seccomp for strict mode with snaps
(LP: #1721676)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW

  * Backport recent bbr bugfixes to 4.10 kernel (LP: #1708604)
- tcp_bbr: cut pacing rate only if filled pipe
- tcp_bbr: introduce bbr_bw_to_pacing_rate() helper
- tcp_bbr: introduce bbr_init_pacing_rate_from_rtt() helper
- tcp_bbr: remove sk_pacing_rate=0 transient during init
- tcp_bbr: init pacing rate on first RTT sample

  * [SRU][Zesty] Fix lscpu segfault on ARM64 with SMBIOS v2.0 (LP: #1716483)
- arm64: kernel: restrict /dev/mem read() calls to linear region

 -- Kleber Sacilotto de Souza   Tue, 10 Oct
2017 13:49:34 +0200

** Changed in: linux (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000252

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10663

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10911

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-11176

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-14340

-- 
You

[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-10-27 Thread Kleber Sacilotto de Souza 
Hello IBM,

Could you please verify the fix with the zesty kernel currently in
-proposed?

Thank you!

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-10-18 Thread Kleber Sacilotto de Souza 
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
zesty' to 'verification-done-zesty'. If the problem still exists, change
the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-zesty

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-10-09 Thread Thadeu Lima de Souza Cascardo 
** Changed in: linux (Ubuntu Zesty)
   Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Additional Hardware Info---
  Power9 dd2.0

  Machine Type = Power9

  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was
  constant

  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

     415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-20 Thread Joseph Salisbury 
** Description changed:

+ == SRU Justification ==
+ There is a significantly higher number of task migrations when the load is 
+ fixed and not balanced across cores.
+ 
+ Benchmark results are posted in the bug description and in the commits
+ git log.
+ 
+ This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
+ in mailine as of 4.12-rc1.
+ 
+ 
+ == Fix ==
+ commit 05b40e057734811ce452344fb3690d09965a7b6a
+ Author: Srikar Dronamraju 
+ Date:   Wed Mar 22 23:27:50 2017 +0530
+ 
+ sched/fair: Prefer sibiling only if local group is under-utilized
+ 
+ == Regression Potential ==
+ Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
+ allow a local group to pull a task, if the source group has more number of 
+ tasks than the local group.
+ 
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug 
reporter.
+ The bug reporter states the test kernel resolved the bug.
+ 
+ 
+ 
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
-  
+ 
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
-  
+ 
  ---Additional Hardware Info---
- Power9 dd2.0 
+ Power9 dd2.0
  
- Machine Type = Power9 
-  
+ Machine Type = Power9
+ 
  ---Steps to Reproduce---
-  Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.
+  Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.
  
  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.
  
- Ideally, it should have been very minimal, as the over all load was constant
-  
+ Ideally, it should have been very minimal, as the over all load was
+ constant
+ 
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem
  
  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix
  
  Here is perf stat without fix.
  
  Performance counter stats for 'system wide' (5 runs):
  
-  7,758  sched:sched_migrate_task
+  7,758  sched:sched_migrate_task
  ( +-  1.28% )
  
-  100.015658079 seconds time elapsed
+  100.015658079 seconds time elapsed
  ( +-  0.00% )
  
  perf stat with fix.
  
  Performance counter stats for 'system wide' (5 runs):
  
-415  sched:sched_migrate_task
+    415  sched:sched_migrate_task
  ( +- 11.74% )
  
-  100.016021787 seconds time elapsed
+  100.016021787 seconds time elapsed
  ( +-  0.00% )
- 
  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0
  
  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

-- 
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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  == SRU Justification ==
  There is a significantly higher number of task migrations when the load is 
  fixed and not balanced across cores.

  Benchmark results are posted in the bug description and in the commits
  git log.

  This bug is resolved by mainline commit 
05b40e057734811ce452344fb3690d09965a7b6a, which is 
  in mailine as of 4.12-rc1.

  
  == Fix ==
  commit 05b40e057734811ce452344fb3690d09965a7b6a
  Author: Srikar Dronamraju 
  Date:   Wed Mar 22 23:27:50 2017 +0530

  sched/fair: Prefer sibiling only if local group is under-utilized

  == Regression Potential ==
  Medium, since this commit does touch the scheduler.  However, the commit only 
makes a change to 
  allow a local group to pull a task, if the source group has more number of 
  tasks than the local group.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.

  ---uname output---

[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-18 Thread Manoj Iyer 
** Tags added: triage-g

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-13 Thread Frank Heimes 
** Changed in: ubuntu-power-systems
   Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-13 Thread Joseph Salisbury 
@jhopper, yes, I will submit a SRU request for commit 05b40e0577 to be
included in 17.04.

** Changed in: linux (Ubuntu)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu)
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Joseph Salisbury (jsalisbury)

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Zesty)
   Status: New => In Progress

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Zesty)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-12 Thread Andrew Cloke 
Thanks for the update. Can this issue now be closed?

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-11 Thread Joseph Salisbury 
You may have to install the linux-tools-common with the stock kernel
before installing the test kernel?

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-10 Thread Frank Heimes 
** Changed in: ubuntu-power-systems
   Status: New => Triaged

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-08 Thread Joseph Salisbury 
Did you happen to install both the linux-image and linux-image-extra
.deb packages?

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-09-06 Thread Joseph Salisbury 
I built a Zesty test kernel with commit 05b40e0577.  The test kernel can
be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1713576

Can you test this kernel and see if it resolves this bug?

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-08-29 Thread Joseph Salisbury 
** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
   Status: New => Triaged

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1713576

Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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[Kernel-packages] [Bug 1713576] Re: More migrations with constant load

2017-08-29 Thread Andrew Cloke 
** Also affects: ubuntu-power-systems
   Importance: Undecided
   Status: New

** Changed in: ubuntu-power-systems
   Importance: Undecided => High

** Changed in: ubuntu-power-systems
 Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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Title:
  More migrations with constant load

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN  - 2017-08-06 13:44:45 ==
  ---Problem Description---
  Significantly higher number of task migrations when the load is fixed but not 
balanced across cores.
   
  ---uname output---
  Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06 
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  ---Additional Hardware Info---
  Power9 dd2.0 

  Machine Type = Power9 
   
  ---Steps to Reproduce---
   Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32 
cores/ SMT4 mode.

  When 64 threads was run - the migrations were less over 10s interval.
  when 80 threads were run - the migrations were very high.

  Ideally, it should have been very minimal, as the over all load was constant
   
  == Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
  As suspected (commit :  05b40e0577 : "sched/fair: Prefer sibiling only if 
local group is under-utilized")
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
  should fix the problem

  Ran ' perf stat -a -r 5 -e sched:sched_migrate_task 
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
  to detect the problem and verify the fix

  Here is perf stat without fix.

  Performance counter stats for 'system wide' (5 runs):

   7,758  sched:sched_migrate_task
  ( +-  1.28% )

   100.015658079 seconds time elapsed
  ( +-  0.00% )

  perf stat with fix.

  Performance counter stats for 'system wide' (5 runs):

 415  sched:sched_migrate_task
  ( +- 11.74% )

   100.016021787 seconds time elapsed
  ( +-  0.00% )

  
  git describe on upstream kernel says v4.11-rc2
  # git describe 05b40e0577
  v4.11-rc2-227-g05b40e0

  == Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
  Attaching the patch that needs to be applied to fix this bug.
  Verified that patch fixes the problem.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713576/+subscriptions

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