machdep.cpu_idle_hlt and SMP perf?
Andrew Gallatin
gallatin at cs.duke.edu
Mon Feb 6 06:25:53 PST 2006
Marcin Jessa writes:
> On Fri, 3 Feb 2006 17:51:14 -0500
> Kris Kennaway <kris at obsecurity.org> wrote:
>
> > On Fri, Feb 03, 2006 at 05:47:32PM -0500, Andrew Gallatin wrote:
> > >
> > > Why dooes machdep.cpu_idle_hlt=1 drop my 10GbE network rx
> > > performance by a considerable amount (7.5Gbs -> 5.5Gbs)?
> >
> > I don't know, but I've set this to 0 on my machines because I also
> > noticed a significant performance drop on general workloads with it
> > set to 1.
>
> On a 32 or 64-bits CPU?
This is on amd64.
Drew
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