Date: Mon, 6 Feb 2006 14:46:36 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: machdep.cpu_idle_hlt and SMP perf? Message-ID: <17383.42908.349070.31155@grasshopper.cs.duke.edu> In-Reply-To: <43E74872.7000002@freebsd.org> References: <17379.56708.421007.613310@grasshopper.cs.duke.edu> <43E74872.7000002@freebsd.org>
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Andre Oppermann writes: > Andrew Gallatin wrote: > > Why dooes machdep.cpu_idle_hlt=1 drop my 10GbE network rx > > performance by a considerable amount (7.5Gbs -> 5.5Gbs)? <...> > This may be the same problem OpenBSD has fixed last year in the handling > of the idle loop. From the kerneltrap posting: <....> > First commit message: > http://marc.theaimsgroup.com/?l=openbsd-cvs&m=111692513727274&w=2 > > The MFC with all changes in one commit message: > http://marc.theaimsgroup.com/?l=openbsd-cvs&m=111859519015510&w=2 The bug they fixes was missing interrupts by both calling APM's idle routine, which may hlt, and hlt'ing in the idle loop itself. Since I have no idea what acpi is doing, I got excited about this. Alas, it seems like this isn't it. I pointed cpu_idle_hook back to cpu_idle_default and away from acpi_cpu_idle, but that made no difference. Drew
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