i am seeing the same problem on 11.10
please see here my description
http://ubuntuforums.org/showthread.php?p=11612057
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https://bugs.launchpad.net/bugs/513848
Title:
[karmic] CPU load
This bug was fixed in the package linux - 2.6.31-22.68
---
linux (2.6.31-22.68) karmic-proposed; urgency=low
[ Andy Whitcroft ]
* SAUCE: docs -- fix doc strings for fc_event_seq
[ Brad Figg ]
* SAUCE: (no-up) Modularize vesafb -- fix initialization
- LP: #611471
[
** Tags added: verification-done
** Tags removed: verification-needed
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[karmic] CPU load not being reported accurately
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Accepted linux into karmic-proposed, the package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!
** Tags removed: verification-done
**
Installed. Looks normal. I didn't test any specific load however.
$ apt-cache policy linux-image-virtual
linux-image-virtual:
Installed: 2.6.31.22.35
Candidate: 2.6.31.22.35
Version table:
*** 2.6.31.22.35 0
500 http://archive.ubuntu.com karmic-updates/main Packages
500
@Peter, thanks for testing that's much appreciated. Did you test the package in
-proposed ?
What's the output of apt-cache policy linux-image-2.6.31-22-generic ?
Could you try to reproduce the load you initially reported and tell us
if the kernel in -proposed fixes it
Thanks in advance for
$ apt-cache policy linux-image-generic
linux-image-generic:
Installed: (none)
Candidate: 2.6.31.22.35
Version table:
2.6.31.22.35 0
500 http://archive.ubuntu.com karmic-updates/main Packages
500 http://security.ubuntu.com karmic-security/main Packages
A customer was
SRU verification for Karmic:
I have reproduced the problem with linux 2.6.31-22.65 in karmic-updates and
have verified that the version of linux 2.6.31-22.66 in -proposed fixes the
issue. I've been using Chase's testcase and the load average is reported
correctly.
Marking as verification-done
** Branch linked: lp:ubuntu/karmic-proposed/linux-mvl-dove
** Branch linked: lp:ubuntu/karmic-proposed/linux-ec2
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Accepted linux into karmic-proposed, the package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!
** Tags added: verification-needed
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Currently in karmic-proposed, awaiting approval from ubuntu-sru
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Currently in karmic-proposed unapproved queue, awaiting approval from
ubuntu-sru
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** Branch linked: lp:ubuntu/lucid-proposed/linux-qcm-msm
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** Changed in: linux (Ubuntu Karmic)
Status: In Progress = Fix Committed
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** Branch linked: lp:ubuntu/linux-mvl-dove
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** Branch linked: lp:ubuntu/linux-ec2
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** Changed in: linux (Ubuntu)
Status: In Progress = Fix Committed
** Also affects: linux (Ubuntu Karmic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Karmic)
Status: New = In Progress
** Changed in: linux (Ubuntu Karmic)
Importance: Undecided = Low
Stable Release Update Justification:
Impact of bug: On low load systems with specific work load
characteristics the load average may not be representative of the real
load. Given a specific test case it is possible to load a system with
NR_CPUS number of tasks and yet have a load avg of 0.00,
** Attachment added: testcase
http://launchpadlibrarian.net/43572858/testcase
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** Patch added:
0001-sched-update-load-count-only-once-per-cpu-in-10-tick.patch
http://launchpadlibrarian.net/43572916/0001-sched-update-load-count-only-once-per-cpu-in-10-tick.patch
** Changed in: linux (Ubuntu Karmic)
Milestone: None = karmic-updates
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[karmic] CPU load not being
I accidentally nominated this for jaunty by mistake. Please ignore.
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This bug was fixed in the package linux - 2.6.32-20.29
---
linux (2.6.32-20.29) lucid; urgency=low
[ Andy Whitcroft ]
* Revert SAUCE: Use MODULE_IMPORT macro to tie intel_agp to i915
- LP: #542251
* add Breaks: against hardy lvm2
- LP: #528155
[ Colin Watson ]
*
Spoke to tgabi. The kernel is reporting fine.
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Looks much better, although little bit weird in the way it rises/falls.
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@tgabi:
Can you be more specific? If things are working correctly, then great.
Otherwise, I'll need more information.
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@tgabi:
I've done some testing of my own, and I don't think the ~defer1 kernel
is working properly. Let me work some more on the fix.
Thanks
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@tgabi:
Sorry for the false alarm. I had an incorrect patch laying around, but
the correct patch should be in the kernel I listed above. I also tested
the patch against a test program I have attached. Without the patch, the
test program will ensure at least 90% processor usage, but I have
@tgabi:
I've uploaded a new test kernel to
http://people.canonical.com/~cndougla/513848/linux-
image-2.6.31-21-server_2.6.31-21.58~printk2_amd64.deb. This kernel will
print out each time the calc_load_tasks counter is changed between the
time each cpu increments it to represent the running
** Attachment added: tested with : 2.6.31-21-server #58 SMP Thu Mar 18
16:04:20 UTC 2010 x86_64 GNU/Linux
http://launchpadlibrarian.net/41306357/test2-dmesg.bz2
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@tgabi:
This latest log confirms my theory. There are only two situations where
the calc_load_tasks counter is incremented: once when each process
updates the counter every 5 seconds, and when a processor switches from
an uninterruptible task to the idle task. The first increment is always
@tgabi:
I've uploaded a new kernel to
http://people.canonical.com/~cndougla/513848/linux-
image-2.6.31-21-server_2.6.31-21.58~defer1_amd64.deb. This kernel defers
any task accounting that occurs during the 10 tick load avg update
window until the next accounting done by any cpu after the 10 tick
** Attachment added: Longer running dmesg
http://launchpadlibrarian.net/41245612/test1-dmesg.bz2
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** Attachment added: Longer running dstat
http://launchpadlibrarian.net/41245656/test1-dstat.bz2
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@tgabi:
calc_load_tasks is an integer [1]. It basically represents the latest
data point used for load avg calculation and is only updated once by
each cpu every 5 seconds.
[1] http://lxr.linux.no/linux+v2.6.33/kernel/sched.c#L2997
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[karmic] CPU load not being reported accurately
@tgabi:
In the log you just posted there seems to be way too many running tasks
that are never accounted for in calc_load_tasks. I will try to figure
out a reasonable way to debug what is going on.
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You
The good news is that the dstat matches up perfectly with the
calc_load_tasks values in dmesg, so we know that the issue is confined
to calc_load_tasks not being representative of the number of running
processes in the system.
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[karmic] CPU load not being reported accurately
Tomcat is using a large number of java threads.
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@tgabi:
I found that the calc_load_tasks counter is updated in two areas: once
every 5 seconds before the load avg is calculated, and every time a cpu
enters the idle task. The latter occurs very frequently if the system
isn't loaded very much, which seems to be the case for your server.
Every
** Changed in: linux (Ubuntu)
Status: Incomplete = In Progress
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Is that a desktop kernel ? I'm going to test anyway, but there may be
differences
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** Attachment added: tested with : 2.6.31-21-generic #58 SMP Tue Mar 16
18:24:55 UTC 2010 x86_64 GNU/Linux
http://launchpadlibrarian.net/41228713/test-kernel-result1.txt
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@tgabi:
Sorry about the kernel type, I should have built a -server kernel for
you. However, there shouldn't be any process statistics differences
between -server and -generic kernels.
Thanks for the logging output. Unfortunately the dmstat output doesn't
have any timestamps associated with it.
I'll redo the test shortly. However is puzzling looking at something
like this:
Mar 18 11:20:50 web41 kernel: [ 2059.210041] calc_global_load:3014 cpu: 0,
nr_running: 2, nr_uninterruptible: 84
Mar 18 11:20:50 web41 kernel: [ 2059.210044] calc_global_load:3014 cpu: 1,
nr_running: 0,
I've uploaded a -server kernel to
http://people.canonical.com/~cndougla/513848 for testing.
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@tgabi:
The two printouts are somewhat imprecise. The calc_load_tasks value is
the exact value used for calculating the load avg you see in user space.
I printed out the nr_running and nr_uninterruptible counts just for
information.
The difference here is that the nr_* counts are the counts at
Well, unless the calc_load_tasks is integer it still doesn't make sense.
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** Changed in: linux (Ubuntu)
Status: Incomplete = New
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I have uploaded a test kernel to
http://people.canonical.com/~cndougla/513848. Install the kernel and run
a normal load. It will print out the number of running and
uninterruptible processes each time the load average is calculated
(every 5 seconds) to the kernel log. Please take a screenshot with
Here are new screenshots for Jaunty and Karmic. Each test ran for a
good 25 minutes. I've also added a Karmic screenshot for 'top' showing
(some of) the threads associated with the single Java process. In
addition, I have copied my recent post (2010-03-10) to kernel-
t...@lists.ubuntu.com :
** Attachment added: dstat+top+jconsole-904-A_80p.png
http://launchpadlibrarian.net/40877627/dstat%2Btop%2Bjconsole-904-A_80p.png
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** Attachment added: dstat+top+jconsole-910-A_80p.png
http://launchpadlibrarian.net/40877638/dstat%2Btop%2Bjconsole-910-A_80p.png
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I wish I could have gotten a higher CPU usage out of the Karmic test.
Nonetheless, I believe I have a very valid case for discussion.
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** Attachment added: top_threads-910-A.png
http://launchpadlibrarian.net/40877640/top_threads-910-A.png
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Are you able to test and reproduce this is on a range of hardware, or
just a single model or machine?
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Greetings,
I'm the one who originally reported this bug.
@Chase Douglas
The bug is present on a variety of hardware: single CPU, dual CPU, AMD, Intel.
One more info that has not been added to the description: when one of
the Java threads goes into close loop (some bug in image processing) and
I've uploaded comparable screenshots for both Jaunty and Karmic.
** Attachment added: dstat+top+jconsole-904.png
http://launchpadlibrarian.net/39827765/dstat%2Btop%2Bjconsole-904_edited.png
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** Attachment added: dstat+top+jconsole-910.png
http://launchpadlibrarian.net/39827774/dstat%2Btop%2Bjconsole-910_edited.png
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In the jaunty image I can see both the load avg and about 15 mins of cpu
usage. They seem to correlate well with each other. In the karmic image
I can only see the load avg and one to two mins of cpu usage. Based on
what I see, the reported load avg number for 5 mins and 1 min seem
reasonable. The
@ Peter Matulis, will it be possible to post a screenshot with the
output of dmstat -cmdlni 5 for Karmic as well? Also can you post the
screenshot with the output of top for jaunty ?
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@Peter Matulis,
First, please edit the description for consistency. First you say that
using tomcat on karmic does not produce an expected load. Then you say
that stress tools applied to Karmic does result in an increase in load
(as expected). I am guessing that you are meaning to say that Jaunty
@Chase Douglas
The description is fine. On Karmic, using a generic stress tool
('stress') the simulated load is reported but the specific (real-life)
load I refer to is not. So the problem is a subtle one.
Thank you for the tutorial on cpu load. A *zero* load, however, that
corresponds to
** Changed in: linux (Ubuntu)
Importance: Undecided = Low
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The load avg is only related to the number of runnable/uninterruptible
processes. There can be hundreds of threads and 0.00 load avg if they
are all waiting or sleeping.
However, your screenshot shows consistent cpu utilization of 15-20%, so
one would think the load avg would be at least 0.2 for
** Attachment added: dmesg
http://launchpadlibrarian.net/38757652/dmesg.txt
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Linux ewp1 2.6.31-14-server #48-Ubuntu SMP Fri Oct 16 15:07:34 UTC 2009
x86_64 GNU/Linux
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** Attachment added: load for 9.04
http://launchpadlibrarian.net/38493677/screenshot_904.png
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** Attachment added: load for 9.10
http://launchpadlibrarian.net/38493692/screenshot_910.png
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** Description changed:
Overview:
Using java-based tools (tomcat) on 64-bit server Karmic reports almost
- non-existent CPU load. Screenshot (screenshot_910.png) displays this.
- However, the same load applied to Jaunty shows a different report
- (screenshot_904.png). Note that stress
68 matches
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