Date: Thu, 4 Nov 2004 09:05:45 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: arch@freebsd.org Subject: Re: HEADSUP: HZ=1000 by default on i386 Message-ID: <Pine.NEB.3.96L.1041104090425.64869Q-100000@fledge.watson.org> In-Reply-To: <39210.1099557885@critter.freebsd.dk>
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On Thu, 4 Nov 2004, Poul-Henning Kamp wrote: > We increasingly need better granularity in our sleep/wakeup calls and > things like device polling and trafic shaping needs higher granularity > in particular. > > So pending any really good arguments to the contrary I plan to increase > HZ to 1000 on i386 this weekend. I don't object to increasing HZ, but will note that it results in a slight increase in overhead relative to lower values on the same hadware. It was observed to me, however, that with modern CPUs, running HZ ten times faster still results in a less overhead than on older processors with the slower HZ, so... :-) Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research > > You can still define any HZ value you like in your kernel config file > or even set it from the loader. > > -- > 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. > _______________________________________________ > freebsd-arch@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org" >
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