Re: [gentoo-user] cgroupd really do work!

[Florian Philipp <lists@f_philipp.fastmail.net>]

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Am 05.12.2010 15:55, schrieb Florian Philipp:
> Am 04.12.2010 22:00, schrieb Mark Knecht:
>> On Fri, Dec 3, 2010 at 6:16 PM, William Kenworthy <billk@iinet.net.au> wrote:
>>> On Fri, 2010-12-03 at 17:20 -0800, Mark Knecht wrote:
>>>> On Fri, Dec 3, 2010 at 4:41 PM, William Kenworthy <billk@iinet.net.au> wrote:
>>>>> Re the discussion on cgroups on the 24/25 november - on my old AMD
>>>>> barton 2500+ desktop - in the past a load of anything more than 5 made
>>>>> it very painful to use.  Add in running windows in a qemu vm at the same
>>>>> time (all in 1.5G ram) and its almost unusable as an interactive
>>>>> desktop.
>>>>>
>>>>> Now, with Florians (thanks for the scripts) version of using it on
>>>>> gentoo, even at a load in excess of 12, its almost as good as with no
>>>>> load for desktop operations!
>>>>>
>>>>> To get the high load I am compiling a new kernel, running win2k in qemu,
>>>>> emerging latest updates, browsing the web and reading email in
>>>>> evolution, running updatedb and other cron jobs (just restarted after a
>>>>> tuxonice hibernate so everything is triggering at once!).
>>>>>
>>>>> Really, really, really neat!
>>
>> If you're up for it maybe try putting doing a Gentoo Wiki page.
>>
>> Sounds like it's working pretty well. I'd like to try it but I don't
>> have much time to focus on digging out the info.

> 
> As you wish:
> http://en.gentoo-wiki.com/wiki/Improve_responsiveness_with_cgroups
> 
> I welcome any improvements. This is my first wiki article and English is
> not my mother tongue.
> 

Hmm, I just noticed that something is not right here: Everything works
fine as long as I limit the cgroups to cpu scheduling (`mount -t cgroup
cgroup /dev/cgroup -o cpu`). As soon as I add the blkio subsystem for
disk I/O scheduling ("-o cpu,blkio" or no "-o" at all), I can no longer
create cgroup hierarchies. Only the top level "user" cgroup is accepted.

Another issue is that the kernel documentation in
/usr/src/linux/Documentation/cgroups/cgroups.txt specifies that the
release_agent can also be included as a mount option with
`mount -t cgroup cgroup /dev/cgroup -o
cpu,release_agent='/usr/local/sbin/cgroup_clean'`
That seems to be no valid option, though. At least on my system it
causes mount to fail. Unfortunately there is no output on dmesg.

Can someone else reproduce this? I'm on gentoo-sources-2.6.34-r12.

Thanks in advance!
Florian Philipp


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