linux-kernel - Re: [patch] CFS scheduler, -v7

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Message-Id: <200705031649.23331.a1426z@gawab.com>
Date:	Thu, 3 May 2007 16:49:23 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v7

Ingo Molnar wrote:
> * Al Boldi <a1426z@...ab.com> wrote:
> > [...] But I can still see these awful latency blips in the presence of
> > negatively niced chew.c at -10 and two chew.c's at nice 0. [...]
>
> of course: you asked for the two chew's to be treated like that and CFS
> delivered it! :-)
>
> nice -10 means the two chew's will get ~90+% of the CPU time, and all
> other nice 0 tasks will get <10% of CPU time.

Yes, but the latencies fluctuate wildly from 5ms to 
sched_granularity_ns*1000.  Isn't it possible to smooth this?


Thanks!

--
Al

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