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Message-ID: <82e4877d0805051440o273b6a6dge7f0af310c266fb7@mail.gmail.com>
Date: Mon, 5 May 2008 17:40:49 -0400
From: "Parag Warudkar" <parag.warudkar@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>
Subject: Re: [PATCH] default to n for GROUP_SCHED and FAIR_GROUP_SCHED
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Sam Ravnborg" <sam@ravnborg.org>, LKML <linux-kernel@vger.kernel.org>,
       "akpm@osdl.org" <akpm@linux-foundation.org>,
       "Peter Zijlstra" <peterz@infradead.org>,
       "Dave Jones" <davej@redhat.com>
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On Mon, May 5, 2008 at 5:05 PM, Ingo Molnar <mingo@elte.hu> wrote:
>

>  This is now believed to be fixed in sched-devel.git, via the "single
>  runqueue" and deadline-scheduling patches from Peter that flattens the
>  hierarchy of the group scheduler.
>
>  Another latency source was the skew of sched_clock() running too slow -
>  that way if the clock runs at 10% of its intended speed the scheduler
>  will turn a 40msec intended latency target into a 400 msec latency
>  target!
>
>  This bug too is now believed to be fixed via Peter's new sched_clock
>  code in sched-devel.git.

Ok, but the latency problems are not fixed with sched-devel as of
today. I still get unusable audio if I enable GROUP_SCHED stuff on
sched-devel and run make -j8 .

Parag