Date: Fri, 28 Oct 2005 16:12:08 -0400 From: Chuck Swiger <cswiger@mac.com> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, current@freebsd.org Subject: Re: Timers and timing, was: MySQL Performance 6.0rc1 Message-ID: <43628618.6080004@mac.com> In-Reply-To: <20051028200007.GP4115@funkthat.com> References: <4361F057.4030904@pp.nic.fi> <30622.1130493370@critter.freebsd.dk> <20051028200007.GP4115@funkthat.com>
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John-Mark Gurney wrote: > Poul-Henning Kamp wrote this message on Fri, Oct 28, 2005 at 11:56 +0200: [ ... ] > time(): 0.65022 > gettimeofday(): 0.60886 > hydrogen,ttypa,/tmp,503#sysctl kern.timecounter.hardware=ACPI-fast > kern.timecounter.hardware: TSC -> ACPI-fast [ ... ] > time(): 1.33242 > gettimeofday(): 1.33421 > > I was quite impressed by the speed up using the TSC over ACPI-fast... Yes, but the frightening code in sys/i386/isa/clock.c suggests that the TSC and SMP do not play nice together, and neither does power-management stuff. -- -Chuck
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