[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #22 from Bc. Slavomir Danas   
2011-04-09 17:45:57 ---
This is while kslowd consumed approx. 75% CPU:


   PerfTop:   0 irqs/sec  kernel:-nan%  exact: -nan% [1000Hz cycles], 
(all, 2 CPUs)

 3215.00 86.8% delay_tsc
/lib/modules/2.6.38-ck-BKL/build/vmlinux
  163.00  4.4% read_hpet
/lib/modules/2.6.38-ck-BKL/build/vmlinux
  110.00  3.0% set_clock
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   55.00  1.5% get_clock
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   45.00  1.2% get_data 
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   28.00  0.8% rb_next  
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% _raw_spin_lock_irqsave   
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% hpet_legacy_next_event   
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% set_data 
/lib/modules/2.6.38-ck-BKL/build/vmlinux
6.00  0.2% __pthread_mutex_lock_internal
/lib64/libpthread-2.11.3.so 
5.00  0.1% acpi_os_read_port
/lib/modules/2.6.38-ck-BKL/build/vmlinux

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #21 from Chris Wilson   2011-04-09 
17:01:53 ---
Please do a "perf top" to see what tasklet is actually being run by kslowd.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #20 from Bc. Slavomir Danas   
2011-04-09 16:51:37 ---
Created an attachment (id=53912)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=53912)
kworker polling hogs CPU on 2.6.38

kworker polling hogs CPU on 2.6.38
Gentoo x64
gentoo-sources 2.6.38
HP ProBook 4510s

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company Device [103c:3072]
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at d000 (64-bit, non-prefetchable) [size=4M]
Memory at c000 (64-bit, prefetchable) [size=256M]
I/O ports at 50f0 [size=8]
Expansion ROM at  [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 3
Kernel driver in use: i915

Attached external LCD TV at 720p via HDMI cable

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #19 from Bc. Slavomir Danas   
2011-04-09 16:48:51 ---
You should definetely reopen this as I still have issues on 2.6.38. Will
provide anything to help you resolve it. See following attachement...

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #19 from Bc. Slavomir Danas slavomir.da...@gmail.com  2011-04-09 
16:48:51 ---
You should definetely reopen this as I still have issues on 2.6.38. Will
provide anything to help you resolve it. See following attachement...

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #21 from Chris Wilson ch...@chris-wilson.co.uk  2011-04-09 
17:01:53 ---
Please do a perf top to see what tasklet is actually being run by kslowd.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-04-09 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #22 from Bc. Slavomir Danas slavomir.da...@gmail.com  2011-04-09 
17:45:57 ---
This is while kslowd consumed approx. 75% CPU:


   PerfTop:   0 irqs/sec  kernel:-nan%  exact: -nan% [1000Hz cycles], 
(all, 2 CPUs)

 3215.00 86.8% delay_tsc
/lib/modules/2.6.38-ck-BKL/build/vmlinux
  163.00  4.4% read_hpet
/lib/modules/2.6.38-ck-BKL/build/vmlinux
  110.00  3.0% set_clock
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   55.00  1.5% get_clock
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   45.00  1.2% get_data 
/lib/modules/2.6.38-ck-BKL/build/vmlinux
   28.00  0.8% rb_next  
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% _raw_spin_lock_irqsave   
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% hpet_legacy_next_event   
/lib/modules/2.6.38-ck-BKL/build/vmlinux
7.00  0.2% set_data 
/lib/modules/2.6.38-ck-BKL/build/vmlinux
6.00  0.2% __pthread_mutex_lock_internal
/lib64/libpthread-2.11.3.so 
5.00  0.1% acpi_os_read_port
/lib/modules/2.6.38-ck-BKL/build/vmlinux

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-18 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #17 from Bc. Slavomir Danas slavomir.da...@gmail.com  2011-01-18 
18:18:36 ---
It doesn't seem to me as sane to consume this amount of CPU time to poll for
anything (see attached screenshot). I figured a way how to reproduce this, I've
enabled RandR polling in KDE, attached LCD TV via HDMI and played a video in
VLC. After few mouse clicks in the menu of VLC I've witnessed jerky mouse
movement and later my X has frozen completely. I've switched to console and
found out that when I unpluged HDMI the kworker process went quiet.
I was able to take one screenshot but as my X froze I saw 3 kworker processes
running, eating all CPU time rendering my system useless (no chance to take
screenshot at that moment).
I repeat I'm running latest gentoo-sources-2.6.37.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-16 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #14 from Florian Mickler flor...@mickler.org  2011-01-16 12:46:57 
---
You write in comment #11 about 'disabling the boot drm_kms_helper.poll=N'... 

Did you mean with that, that the problem is in 2.6.37 (final) still present and
only solved by putting drm_kms_helper.poll=N on the commandline... 


or 

Even with polling disabled via the commandline drm_kms_helper.poll=N you
experience the symptoms?


Regards,
Flo

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-16 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #15 from Bc. Slavomir Danas slavomir.da...@gmail.com  2011-01-16 
19:45:49 ---
I've had this drm_kms_helper.poll=N kernel workaround in my grub since I've
discovered it in 18802 bug (around 2.6.36-r2 i think) because I've suffered by
the udev drm polling storm in 2.6.34, kslowd in 2.6.35 and kworker in 2.6.36.
Since I've applied it everything was working smooth. I read the announcement
about bug 18802 being duplicate of this bug and it being resolved as of
2.6.36-rc5 so I have removed this kernel setting and rebooted with my 2.6.37
kernel hoping that everything should be fine. But in few minutes the same
symptoms appeared so I reverted back to drm_kms_helper.poll=N kernel option and
everything seems all right again (with the workaround). I can provide more info
on my HW or SW by request.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-16 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #16 from Chris Wilson ch...@chris-wilson.co.uk  2011-01-16 
22:46:41 ---
You need to quantify your observations here. When polling is enabled, then
every 10s the worker will be awoken and consume CPU time checking that all the
displays are the same as before. Unless on your machine it takes a ridiculous
amount of CPU time (say greater than 5%), it is just the cost of the ability
for your computer to automatically detect display changes.

The real bug is the latency it induces... But I digress.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-15 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Bc. Slavomir Danas slavomir.da...@gmail.com changed:

   What|Removed |Added

 CC||slavomir.da...@gmail.com




--- Comment #11 from Bc. Slavomir Danas slavomir.da...@gmail.com  2011-01-15 
20:42:49 ---
This issue is still present for me with Intel 4500 MHD (intel driver 2.14.0,
xorg-server 1.9.3.901, mesa 7.9.1, libdrm 2.4.23) with gentoo-sources 2.6.37.
I've read this announcement and disabled my drm_kms_helper.poll=N kernel boot
param but the issue has come up after few minutes after booting. System was
sluggish and kworker process appeared eating 60% CPU.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-15 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #12 from Chris Wilson ch...@chris-wilson.co.uk  2011-01-15 
22:35:48 ---
(In reply to comment #11)
 This issue is still present for me with Intel 4500 MHD (intel driver 2.14.0,
 xorg-server 1.9.3.901, mesa 7.9.1, libdrm 2.4.23) with gentoo-sources 2.6.37.
 I've read this announcement and disabled my drm_kms_helper.poll=N kernel boot
 param but the issue has come up after few minutes after booting. System was
 sluggish and kworker process appeared eating 60% CPU.

Different culprit - you neither have the affected hardware nor the responsible
hotplug polling enabled.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler  changed:

   What|Removed |Added

 Status|RESOLVED|CLOSED




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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||CODE_FIX




--- Comment #10 from Florian Mickler   2011-01-12 
11:37:46 ---
I'm closing this for now, please reopen or shout if this issue is still
unresolved for you. 

This should have been fixed for intel since 2.6.36-rc5: 

commit 930a9e283516a3a3595c0c515113f1b78d07f695
Author: Chris Wilson 
Date:   Tue Sep 14 11:07:23 2010 +0100

drm: Use a nondestructive mode for output detect when polling (v2)


for nouveau it's probably fixed since v2.6.37-rc3:

commit 01db363979e96115a895f35c823303660f0f328d
Author: Francisco Jerez 
Date:   Thu Oct 21 17:43:08 2010 +0200

drm/nouveau: Use "force" to decide if analog load detection is ok or not.



and for radeon since v2.6.37-rc1:

commit c3cceeddf0b5f97b0d2352b98ef0f025e31a9ae3
Author: Dave Airlie 
Date:   Tue Oct 26 12:55:52 2010 +1000

drm/radeon/kms: don't poll dac load detect.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #9 from Florian Mickler   2011-01-12 
11:19:26 ---
Is this issue still visible on 2.6.37?

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-dae...@bugzilla.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler  changed:

   What|Removed |Added

 CC||edwintorok at gmail.com




--- Comment #8 from Florian Mickler   2011-01-12 
10:48:30 ---
*** Bug 18802 has been marked as a duplicate of this bug. ***

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler flor...@mickler.org changed:

   What|Removed |Added

 CC||edwinto...@gmail.com




--- Comment #8 from Florian Mickler flor...@mickler.org  2011-01-12 10:48:30 
---
*** Bug 18802 has been marked as a duplicate of this bug. ***

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265





--- Comment #9 from Florian Mickler flor...@mickler.org  2011-01-12 11:19:26 
---
Is this issue still visible on 2.6.37?

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler flor...@mickler.org changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||CODE_FIX




--- Comment #10 from Florian Mickler flor...@mickler.org  2011-01-12 11:37:46 
---
I'm closing this for now, please reopen or shout if this issue is still
unresolved for you. 

This should have been fixed for intel since 2.6.36-rc5: 

commit 930a9e283516a3a3595c0c515113f1b78d07f695
Author: Chris Wilson ch...@chris-wilson.co.uk
Date:   Tue Sep 14 11:07:23 2010 +0100

drm: Use a nondestructive mode for output detect when polling (v2)


for nouveau it's probably fixed since v2.6.37-rc3:

commit 01db363979e96115a895f35c823303660f0f328d
Author: Francisco Jerez curroje...@riseup.net
Date:   Thu Oct 21 17:43:08 2010 +0200

drm/nouveau: Use force to decide if analog load detection is ok or not.



and for radeon since v2.6.37-rc1:

commit c3cceeddf0b5f97b0d2352b98ef0f025e31a9ae3
Author: Dave Airlie airl...@redhat.com
Date:   Tue Oct 26 12:55:52 2010 +1000

drm/radeon/kms: don't poll dac load detect.

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[Bug 16265] Why is kslowd accumulating so much CPU time?

2011-01-12 Thread bugzilla-daemon
https://bugzilla.kernel.org/show_bug.cgi?id=16265


Florian Mickler flor...@mickler.org changed:

   What|Removed |Added

 Status|RESOLVED|CLOSED




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