linux-kernel - Re: "sched: add vslice" causes horrible interactivity under load

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Date:	Sun, 27 Jan 2008 23:19:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Benjamin K. Stuhl" <benjamin.stuhl@...orado.edu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux-Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: "sched: add vslice" causes horrible interactivity under load


* Ingo Molnar <mingo@...e.hu> wrote:

> > while such delays are happening? Please enable CONFIG_SCHED_DEBUG=y 
> > and CONFIG_SCHEDSTATS=y as well before doing the dump. Also please 
> > send your .config.
> 
> another thing that might make a difference is to disable (or enable) 
> the CONFIG_FAIR_GROUP_SCHED feature in the .config.

yet another thing to tune would be to decrease the value of 
/proc/sys/kernel/sched_latency, and/or to subtract '4' from the value of 
/proc/sys/kernel/sched_features. [it defaults to 7 in v2.6.24]

	Ingo
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