Date: Fri, 09 Jul 2004 18:26:50 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Chuck Swiger <cswiger@mac.com> Cc: current@freebsd.org Subject: Re: default HZ value in 5.2.1 Message-ID: <25554.1089390410@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 09 Jul 2004 12:23:01 EDT." <40EEC665.5010608@mac.com>
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In message <40EEC665.5010608@mac.com>, Chuck Swiger writes: >Chris Stenton wrote: >> Any reason why the default value for HZ is still set at 100? > >Sure. Timer interrupts and context switching aren't free, you know: the >faster the HZ, the more time the system spends on overhead rather than doing >useful work. > >> Would not 1000 be better for finer granularity? > >Certainly it would, but tradeoffs exist.... Most of my systems run with HZ=1000 already, but that is hardly ground for changes to the default. What we need is some pro et contra arguments, including benchmarks. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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