Re: machdep.cpu_idle_hlt and SMP perf?

From: Kris Kennaway <kris_at_obsecurity.org>
Date: Sat, 4 Feb 2006 14:35:10 -0500
On Sat, Feb 04, 2006 at 11:15:35AM +0000, Marcin Jessa wrote:
> 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?

I only measured on i386.

Kris
Received on Sat Feb 04 2006 - 18:35:12 UTC

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