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

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Message-ID: <487F5F15.4050208@goop.org>
Date:	Thu, 17 Jul 2008 08:02:45 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Alex Nixon (Intern)" <Alex.Nixon@...citrix.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>
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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