Date: Tue, 5 Apr 2005 09:42:12 +0200 From: dick hoogendijk <dick@nagual.st> To: freebsd-questions@freebsd.org Subject: Re: HZ=1000 ? Message-ID: <20050405094212.42b93112.dick@nagual.st> In-Reply-To: <20050404093755.GA48928@epia2.farid-hajji.net> References: <20050404091719.GA9748@lothlorien.nagual.st> <20050404093755.GA48928@epia2.farid-hajji.net>
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On Mon, 4 Apr 2005 11:37:55 +0200 cpghost@cordula.ws wrote: > Interestingly, HZ=100 has remained constant for decades (!), despite > CPUs getting faster all the time. This is an excellent value for most > typical usage patterns. Cranking it up should only be required for > special cases. Anyway, the HZ knob is there. Experiment with it until > you get optimal performance. Thanks for the explanation. Your last remark puzzles me though. 'experiment with it until you get optimal performance' Yeah sure. I like to experiment. I don't want the fuzzy "it /feels/ like its slower/faster" stuff. Way too subjective. Can someone advise me on some test software to expermient with? I.e.: I set hz=100 / hz=1000 / hz=2000 ; with or without polling and I run a testing program that measures the diffs. Does something like this exists? -- dick -- http://nagual.st/ -- PGP/GnuPG key: F86289CE ++ Running FreeBSD 4.11 ++ FreeBSD 5.3 + Nai tiruvantel ar vayuvantel i Valar tielyanna nu vilja
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