Gentoo Bug 103497 - Unstable system because of ondemand cpu scaling governor

Description:

Opened: 2005-08-23 12:17 0000

System becomes unstable when using ondemand cpu scaling governor on kernel. 

Typical scenario: power up, surf the net, read main, emerge stuff and crash.

Typically X crashes without warning or system just reboots. This could happen at
any time: while computer does nothing paticular or middle of, say, emerge
process. Sometimes browser or mail client becomes really sticky and behave oddly
before system hangs it self.

My current kernel is 2.6.12-gentoo-r9 and I enabled ondemand governor by adding
line "echo ondemand >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" to
/etc/conf.d/local.start.

I've seen exactly the same symptoms on other kernels (roughly 2.6.9 - 2.6.10)
but on that time I just decided to stick with the default governor (performance)
until now.



Reproducible: Always
Steps to Reproduce:
1. power on
2. emerge stuff, surf net, read mail, watch a divx movie, etc.
3. system lockup/crash or processes start to misbehave and eventually system
will die

------- Comment #1 From Juha Heljoranta 2005-08-23 12:21:51 0000 -------

Created an attachment (id=66677) [details]
Debug infromation from /var/log/kern.log

The only useful error messages that I have managed to catch.

------- Comment #2 From Juha Heljoranta 2005-08-23 12:22:36 0000 -------

Created an attachment (id=66678) [details]
kernel config file

------- Comment #3 From Juha Heljoranta 2005-08-23 12:23:20 0000 -------

Created an attachment (id=66679) [details]
/etc/make.conf

------- Comment #4 From Daniel Drake 2005-08-23 12:38:09 0000 -------

So this *only* happens with the ondemand governor, no others? (You didn't
include this in "Steps to reproduce")

Can you reproduce this on the latest development kernel (currently
vanilla-sources-2.6.13_rc6)?

------- Comment #5 From Juha Heljoranta 2005-08-24 12:51:44 0000 -------

Yes, this happens only when ondemand cpu scheduler is used.

And yes, I can reproduce this on 2.6.13-rc7 vanilla. I didn't test 2.6.13-rc7
with performance governor to prove that the performance governor works. This
because my regular uptime is +30 days. With ondemand governor the uptime is 1-4
hours.

------- Comment #6 From Juha Heljoranta 2005-08-24 12:54:27 0000 -------

Created an attachment (id=66787) [details]
Backtrace from 2.6.13-rc7

------- Comment #7 From Daniel Drake 2005-08-26 02:41:16 0000 -------

Please file a bug against 2.6.13-rc7 at http://bugzilla.kernel.org including
the
info that you have posted here. Please post the new bug URL here then I will
keep an eye on it.

Filename	Description	Type	Creator	Created	Size	Actions
systemcrashing	Debug infromation from /var/log/kern.log	text/plain	Juha Heljoranta	2005-08-23 12:21 0000	5.81 KB	Details
paska	kernel config file	text/plain	Juha Heljoranta	2005-08-23 12:22 0000	30.40 KB	Details
makeconf	/etc/make.conf	text/plain	Juha Heljoranta	2005-08-23 12:23 0000	678 bytes	Details
2.6.13-rc7-problem	Backtrace from 2.6.13-rc7	text/plain	Juha Heljoranta	2005-08-24 12:54 0000	1.25 KB	Details
Create a New Attachment (proposed patch, testcase, etc.)						View All

Bug 103497 depends on:			Show dependency tree
Bug 103497 blocks:			Show dependency tree

Bugzilla Bug 103497

Unstable system because of ondemand cpu scaling governor

Last modified: 2007-04-29 14:52:27 0000