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

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Message-ID: <20070503123655.GA705@elte.hu>
Date:	Thu, 3 May 2007 14:36:55 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Al Boldi <a1426z@...ab.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] CFS scheduler, -v7

* 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.

in the previous mail i have described the new exponential-scale nice 
levels that CFS introduces. In practice this means that vanilla kernel's 
nice -20 level is roughly equivalent to CFS's nice -6. CFS's nice -10 
would be roughly equivalent to vanilla nice -80 (if it existed).

	Ingo
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