Date: Sat, 4 Feb 2006 14:35:10 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Marcin Jessa <lists@yazzy.org> Cc: freebsd-current@freebsd.org, gallatin@cs.duke.edu, Kris Kennaway <kris@obsecurity.org> Subject: Re: machdep.cpu_idle_hlt and SMP perf? Message-ID: <20060204193510.GA58074@xor.obsecurity.org> 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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[-- Attachment #1 --] 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@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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFD5QHuWry0BWjoQKURAtEyAJ4tj3xryNgdbGoPJ8lZ72Lag4+55gCfYQoI qkQob7/G6d9X/gAhMhRzB8g= =v+5Y -----END PGP SIGNATURE-----
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