Re: [LAU] 200 lines kernel patch

On 21 November 2010 02:33, torbenh <torbenh@email-addr-hidden> wrote:
> On Sat, Nov 20, 2010 at 08:26:45AM -0500, Paul Davis wrote:
>> On Sat, Nov 20, 2010 at 4:48 AM, Atte André Jensen <atte@email-addr-hidden> wrote:
>> > Hi
>> >
>> > Aparently a new, 200 lines kernel patch have been buzzing the web lately,
>> > supposedly it should provide a much more responsive desktop.
>> >
>> > But this userspace alternative should be even better:
>> > http://www.webupd8.org/2010/11/alternative-to-200-lines-kernel-patch.html
>> >
>> > Anyone heard of it, tried it and/or has any thoughts whether it has anything
>> > to offer on a DAW?
>>
>> it doesn't look terribly relevant because a DAW is going to schedule
>> most threads that matter with SCHED_FIFO. these threads will be
>> scheduled by a different set of rules than SCHED_OTHER (i.e. most of
>> the desktop threads, and the scheduling class that is affected by the
>> patch). that's not to say it might not still make things feel a bit
>> better, but it won't really make lower latencies possible etc. etc.. I
>> think.
>
> looking at the 200lines patch... it seems to activate RT_GROUP_SCHED
> if anybody know how the system needs to be configured, so that jackd
> runs with this option on, it might be nice if you told us.
>
> if we really get kernels with this turned on soon, we better be prepared.

In fact, isn't cgroups incompatible with realtime scheduling? Not
quite sure where I'm quoting that from but I vaguely recall something
like that.

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