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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