On Tue, Jul 04, 2006 at 11:47:00PM +0200, Andi Kleen wrote:
> On Tuesday 04 July 2006 23:19, Chuck Ebbert wrote:
> > In-Reply-To: <[email protected]>
> >
> > On Tue, 4 Jul 2006 00:29:39 -0700, Stephane Eranian wrote:
> > > Following my discussion with Andi. Here is a patch that introduces
> > > two new TIF flags to simplify the context switch code in __switch_to().
> > > The idea is to minimize the number of cache lines accessed in the common
> > > case, i.e., when neither the debug registers nor the I/O bitmap are used.
> >
> > I get a 5-10% speedup in task switch times with this patch.
>
> That sounds too much. How did you measure it?
>
> Note that lmbench tends to be unstable for this.
>
Yes, that is my observation as well. Anybody knows of a better
benchmark for ctxsw?
--
-Stephane
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