linux-kernel - RE: Large increase in context switch rate

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Date:	Thu, 17 Jul 2008 17:21:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Alex Nixon (Intern)" <Alex.Nixon@...citrix.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ian Campbell <Ian.Campbell@...citrix.com>
Subject: RE: Large increase in context switch rate

On Thu, 2008-07-17 at 16:14 +0100, Alex Nixon (Intern) wrote:
> Yeah I've checked - the number of context switches seems to be around
> 60k regardless of whether CONFIG_PARAVIRT is switched on, and regardless
> of whether it's running in domu or native (-j4 on dual core)

I'm seeing:

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st

 4  0      0 1148916 120340 472040    0    0     0  1912 2225 3662 78 22  0  0  0
 4  0      0 1130192 120556 489844    0    0     0  1974 2220 3461 77 22  0  0  0

doing make -j4

This is on x86_64 SMP PREEMPT HZ=1000 !PARAVIRT 
(Linus' tree as of somewhere earlier today)



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