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

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Message-ID: <0E902970173AF84089673FA54B7FE78A32906B@lonpexch01.citrite.net>
Date:	Thu, 17 Jul 2008 16:14:00 +0100
From:	"Alex Nixon (Intern)" <Alex.Nixon@...citrix.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"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

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)

-----Original Message-----
From: Jeremy Fitzhardinge [mailto:jeremy@...p.org] 
Sent: 17 July 2008 16:03
To: Peter Zijlstra
Cc: Ingo Molnar; Linux Kernel Mailing List; Alex Nixon (Intern); Ian
Campbell
Subject: Re: Large increase in context switch rate

Peter Zijlstra wrote:
> Is this specific to Xen?, as a native kernel doesn't do more than ~3k
> cs/s with make -j3 on my dual core.
>   

No, it doesn't seem to be.  A CONFIG_PARAVIRT kernel running on bare 
hardware shows the same context switch rate.  Merely turning 
CONFIG_PARAVIRT on should have no effect on context switch rate (though,

Alex, it would be worth double-checking, just to be sure).

    J
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