[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-28 Thread Tim Gardner 
*** This bug is a duplicate of bug 1637520 ***
https://bugs.launchpad.net/bugs/1637520

** This bug has been marked a duplicate of bug 1637520
   Yakkety update to v4.8.5 stable release

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-18 Thread Joseph Salisbury 
I built a test kernel with the proposed patch from upstream.  The test kernel 
can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/upstream/

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

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-13 Thread Omer Akram 
That's correct, that dump_buggy is without stress running.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-13 Thread Joseph Salisbury 
>From Upstream:

"> Here is the dump before stress is started:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760437/+files/dump_nonbuggy

This one is ok.
The dump indicates Sched Debug Version: v0.11, 4.8.0-11-generic
#12~lp1627108Commit3d30544Reverted
so this is without the culprit commit

>
> Here it is after:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760436/+files/dump_buggy
>

This one has the exact same odds values for system.slice->tg_load_avg
than the 1st dump that you sent yesterday
The dump indicates Sched Debug Version: v0.11, 4.8.0-22-generic #24-Ubuntu
So this dump has been done with a different kernel than for the dump above.
As I can't find any stress task in the dump, i tend to believe that
the dump has been done before starting the stress tasks and not after
starting them. Can you confirm ?

If i'm right, it mean that the problem was already there before
starting stress tasks."

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-13 Thread Omer Akram 
** Attachment added: "dump_buggy"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760436/+files/dump_buggy

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-13 Thread Omer Akram 
I have attached two dumps. One with the buggy kernel and the other with
the kernel that does not show the lag.

** Attachment added: "dump_nonbuggy"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760437/+files/dump_nonbuggy

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-13 Thread Joseph Salisbury 
Update and request from upstream:

"I have looked at the dump and there is something very odd for
system.slice task group where the display manager is running.
system.slice->tg_load_avg is around 381697 but  tg_load_avg is
normally equal to Sum of system.slice[cpu]->tg_load_avg_contrib
whereas Sum of system.slice[cpu]->tg_load_avg_contrib = 1013 in our
case. We can have some differences because the dump of
/proc/shed_debug is not atomic and some changes can happen but nothing
like this difference.

The main effect of this quite high value is that the weight/prio of
the sched_entity that represents system.slice in root cfs_rq is very
low (lower than task with the smallest nice prio) so the system.slice
task group will not get the CPU quite often compared to the user.slice
task group: less than 1% for the system.slice where lightDM and xorg
are running compared 99% for the user.slice where the stress tasks are
running. This is confirmed by the se->avg.util_avg value of the task
groups which reflect how much time each task group is effectively
running on a CPU:
system.slice[CPU3].se->avg.util_avg = 8 whereas
user.slice[CPU3].se->avg.util_avg = 991

This difference of weight/priority explains why the system becomes
unresponsive. For now, I can't explain is why
system.slice->tg_load_avg = 381697 whereas is should be around 1013
and how the patch can generate this situation.

Is it possible to have a dump of /proc/sched_debug before starting
stress command ? to check if the problem is there from the beginning
but not seen because not overloaded. Or if it the problem comes when
user starts to load the system"

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-12 Thread Omer Akram 
I tested the kernel tip from your debs and the issue is very much alive.
Here is the requested dump: http://paste.ubuntu.com/23312351/

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-11 Thread Joseph Salisbury 
Upstream also requested testing of the following repo:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git

I built a test kernel with this tree.  It can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/upstream/

Can you test this kernel and see if it exhibits the bug or not?

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-11 Thread Joseph Salisbury 
The patch author requested that we provide a /proc/sched_debug dump
while the issue is happening.  Can you collect that data?

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Omer Akram 
As notified on on IRC, that is a good kernel.

The issue is easy to reproduce on an X1 Carbon just run `stress -c 4`
and within a few seconds mouse starts to lag and everything becomes
slow.

** Description changed:

  My X1Carbon becomes quite laggy, the cursor hangs for a few seconds and
  then resumes while my system is compiling some code, or lets says
  PyCharm is indexing things or Android Studio is compiling some code. I
  was using 4.4 on Xenial a few days ago and everything was working just
  fine. Installed Yakkety and this issue happens.
+ 
+ TEST CASE:
+ `stress -c 4` <-- that results in system slowness.
+ 
  
  I will downgrade the kernel and see if that mitigates the issue.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-15-generic 4.8.0-15.16
  ProcVersionSignature: Ubuntu 4.8.0-15.16-generic 4.8.0-rc7
  Uname: Linux 4.8.0-15-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
-  USERPID ACCESS COMMAND
-  /dev/snd/pcmC1D0p:   om26er 3390 F...m pulseaudio
-  /dev/snd/controlC1:  om26er 3390 F pulseaudio
-  /dev/snd/controlC0:  om26er 3390 F pulseaudio
+  USERPID ACCESS COMMAND
+  /dev/snd/pcmC1D0p:   om26er 3390 F...m pulseaudio
+  /dev/snd/controlC1:  om26er 3390 F pulseaudio
+  /dev/snd/controlC0:  om26er 3390 F pulseaudio
  CurrentDesktop: Unity
  Date: Fri Sep 23 21:40:34 2016
  HibernationDevice: RESUME=UUID=a92c85ab-cca3-4afc-abf1-3516f193129e
  InstallationDate: Installed on 2016-09-21 (1 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160921)
  MachineType: LENOVO 20BSCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-15-generic.efi.signed 
root=UUID=01b0a4a0-d791-46e8-a212-1f769cff3a4b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-4.8.0-15-generic N/A
-  linux-backports-modules-4.8.0-15-generic  N/A
-  linux-firmware1.161
+  linux-restricted-modules-4.8.0-15-generic N/A
+  linux-backports-modules-4.8.0-15-generic  N/A
+  linux-firmware1.161
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/13/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET32W (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BSCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN14ET32W(1.10):bd08/13/2015:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BSCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Joseph Salisbury 
I built a Yakkety test kernel with a revert of commit
3d30544f02120b884bba2a9466c87dba980e3be5.  The test kernel can be
downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1627108/

Can you test that kernel and report back if it has the bug or not?

Note with this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Joseph Salisbury 
The bisect reported this as the first bad commit:

commit 3d30544f02120b884bba2a9466c87dba980e3be5
Author: Peter Zijlstra 
Date:   Tue Jun 21 14:27:50 2016 +0200

sched/fair: Apply more PELT fixes

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
7dc603c9028ea5d4354e0e317e8481df99b06d7e

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/7dc603c9028ea5d4354e0e317e8481df99b06d7e

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Omer Akram 
As reported on IRC, that's a bad kernel.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
3d30544f02120b884bba2a9466c87dba980e3be5

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/3d30544f02120b884bba2a9466c87dba980e3be5

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Martin Pitt 
FTR, I tested #29 which works for Omer, but not for me, so bug 1626436
is not a duplicate.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
ea86cb4b7621e1298a37197005bf0abcc86348d4

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/ea86cb4b7621e1298a37197005bf0abcc86348d4

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-07 Thread Omer Akram 
Ok, the one is comment 28 is bad, while the one in #29 is Good.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
If that kernel is also bad, then the next one is already ready and can
be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1627108/3d89e5478bf550a50c99e93adf659369798263b0/

However, if it is good, I'll have to build the next kernel with a good
result.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I pointed you to the wrong kernel in comment #26.  The URL should have
been:

http://kernel.ubuntu.com/~jsalisbury/lp1627108/55e16d30bd99510900caec913c90f53bc2b35cba/

Can you test that kernel?

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Omer Akram 
Thanks, that's a bad kernel.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
55e16d30bd99510900caec913c90f53bc2b35cba

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/766fd5f6cdaf1d558afba19850493b2603c9625d

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Omer Akram 
That is a bad kernel.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
766fd5f6cdaf1d558afba19850493b2603c9625d

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/766fd5f6cdaf1d558afba19850493b2603c9625d

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
3ebfd81f7fb3e81a754e37283b7f38c62244641a

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/3ebfd81f7fb3e81a754e37283b7f38c62244641a

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Omer Akram 
That's a good kernel build. Seems there are multiple builds in there, so
I tested 201610061038 which is newer.

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
c86ad14d305d2429c3da19462440bac50c183def

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Omer Akram 
Hi! That is a bad kernel, i.e. it contains the regression.

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
0f657262d5f99ad86b9a63fb5dcd29036c2ed916

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Omer Akram 
To add the missing comment, I tried that last kernel last night and that
is a good one as well. I notified Joseph on IRC.

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-06 Thread Martin Pitt 
I filed bug 1626436 which is similar; I wanted to try
http://kernel.ubuntu.com/~jsalisbury/lp1627108 but that is empty?

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
5048c2af078d5976895d521262a8802ea791f3b0

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Omer Akram 
Ok, that is a good kernel. My test is `stress -c 4` and it works fine
i.e. system performance does not degrade.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
52770c37db2c0ee5585dae2de3d19c8453f1e8dc

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Omer Akram 
Same results. This build is infected as well.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
55392c4c06204c8149dc09cf474691f1cc3c

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-05 Thread Omer Akram 
Tested, the latest kernel build that you provided is bad as well.

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-04 Thread Joseph Salisbury 
I built the next test kernel, up to the following commit:
f7816ad0f878dacd5f0120476f9b836ccf8699ea

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-04 Thread Joseph Salisbury 
Omer reports the first test kernel is bad on IRC.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-04 Thread Joseph Salisbury 
I started a kernel bisect between v4.7 final and v4.8-rc1. The kernel
bisect will require testing of about 7-10 test kernels.

I built the first test kernel, up to the following commit:
1c88e19b0f6a8471ee50d5062721ba30b8fd4ba9

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108

Can you test that kernel and report back if it has the bug or not?  I
will build the next test kernel based on your test results.

Thanks in advance

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-04 Thread Omer Akram 
I tried linux 4.8-rc1 and it does have the said regression.

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-04 Thread Joseph Salisbury 
Can you give the v4.8-rc1 kernel a try?  It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8

We can perform a kernel bisect, once we know the last good kernel and
first bad one.


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

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

** Tags removed: needs-bisect
** Tags added: perfomring-bisect

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-03 Thread Omer Akram 
So I tested linux 4.8 final and the regression still exists. On another
note I also tested linux 4.7 and the issue does not exist there.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu Yakkety)
   Status: Incomplete => Confirmed

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  X1Carbon comes to a crawl during high CPU usage tasks

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-10-03 Thread Joseph Salisbury 
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.8 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8

** Changed in: linux (Ubuntu)
   Status: Confirmed => Incomplete

** Tags added: kernel-da-key needs-bisect

** Also affects: linux (Ubuntu Yakkety)
   Importance: High
   Status: Incomplete

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-09-24 Thread Omer Akram 
Confirming, downgrading to 4.4 fixes the issue.

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[Bug 1627108] Re: X1Carbon comes to a crawl during high CPU usage tasks

2016-09-23 Thread Brad Figg 
** Tags added: kernel-4.8

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

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