Re: Large increase in context switch rate

From: Andi Kleen
Date: Thu Jul 17 2008 - 17:43:38 EST

Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
> OK, but that still doesn't account for the relatively large increase
> from 2.6.18 -> 2.6.26. You're using HZ=100 in both cases, I presume.
> The other variable is NOHZ and highres timers. You could try turning
> those off in 2.6.26. Also, CONFIG_PREEMPT could well make a
> difference. 2.6.18-xen doesn't support CONFIG_PREEMPT at all, but
> pvops(-xen) does.

If it's that easily reproducible you could just bisect it?

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