Date: Mon, 6 Feb 2006 09:25:29 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Marcin Jessa <lists@yazzy.org> Cc: freebsd-current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: machdep.cpu_idle_hlt and SMP perf? Message-ID: <17383.23641.160764.974850@grasshopper.cs.duke.edu> In-Reply-To: <20060204111535.31e42861.lists@yazzy.org> References: <17379.56708.421007.613310@grasshopper.cs.duke.edu> <20060203225114.GA9845@xor.obsecurity.org> <20060204111535.31e42861.lists@yazzy.org>
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Marcin Jessa writes: > On Fri, 3 Feb 2006 17:51:14 -0500 > Kris Kennaway <kris@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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