Poul-Henning Kamp wrote this message on Fri, Oct 28, 2005 at 11:56 +0200: > In message <4361F057.4030904_at_pp.nic.fi>, Pertti Kosunen writes: > > >Does polling affect to this test? > > Not apart from the CPU overhead. > > sysctl kern.timecounter.hardware > > is much more important. > > and all the reports here which fail to include it are mostly > useless. hydrogen,ttypa,/tmp,504$grep CPU /var/run/dmesg.boot CPU: AMD Duron(tm) Processor (1211.94-MHz 686-class CPU) hydrogen,ttypa,/tmp,501#sysctl kern.timecounter.hardware=TSC kern.timecounter.hardware: TSC -> TSC hydrogen,ttypa,/tmp,502#./timer null function: 0.00165 getpid(): 0.37850 time(): 0.65022 gettimeofday(): 0.60886 hydrogen,ttypa,/tmp,503#sysctl kern.timecounter.hardware=ACPI-fast kern.timecounter.hardware: TSC -> ACPI-fast hydrogen,ttypa,/tmp,504#./timer null function: 0.00165 getpid(): 0.38530 time(): 1.33242 gettimeofday(): 1.33421 I was quite impressed by the speed up using the TSC over ACPI-fast... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."Received on Fri Oct 28 2005 - 18:00:09 UTC
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