RE: Large increase in context switch rate

From: Alex Nixon (Intern)
Date: Thu Jul 17 2008 - 11:14:20 EST

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@xxxxxxxx]
Sent: 17 July 2008 16:03
To: Peter Zijlstra
Cc: Ingo Molnar; Linux Kernel Mailing List; Alex Nixon (Intern); Ian
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).

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