Date: Sun, 02 Apr 2006 11:34:51 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: Petri Helenius <pete@he.iki.fi> Cc: Eric <ericd@free.fr>, freebsd-smp@freebsd.org, Lucas Holt <luke@foolishgames.com> Subject: Re: Low perf with smp Message-ID: <442F0E1B.9090505@paradise.net.nz> In-Reply-To: <442EAA0A.8030704@he.iki.fi> References: <009301c65418$cc029f30$65fd24c0@Eric> <64659004-E643-4044-AAED-076E0CC91977@foolishgames.com> <01a901c65493$77ad2740$65fd24c0@Eric> <442DC9B6.2090200@paradise.net.nz> <442EAA0A.8030704@he.iki.fi>
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Petri Helenius wrote: > Mark Kirkwood wrote: > >> >> As I understand it, when you activate SMP a more accurate, but slower >> timecounter is chosen (typically 'i8254' instead of 'TSC' on intel HW). > > > ACPI-fast should be the default with SMP. It's significantly faster than > i8254 > Yeah - if his Dell has ACPI enabled. However, ACPI-fast is still slower than say TSC. Eric, do you want to show us the output of $ sysctl kern.timecounter with and without SMP? Cheers Mark
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