Date: Thu, 4 Nov 2004 06:15:23 -0800 From: Luigi Rizzo <rizzo@icir.org> To: Robert Watson <rwatson@freebsd.org> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk> Subject: Re: HEADSUP: HZ=1000 by default on i386 Message-ID: <20041104061523.C61484@xorpc.icir.org> In-Reply-To: <Pine.NEB.3.96L.1041104090425.64869Q-100000@fledge.watson.org>; from rwatson@freebsd.org on Thu, Nov 04, 2004 at 09:05:45AM -0500 References: <39210.1099557885@critter.freebsd.dk> <Pine.NEB.3.96L.1041104090425.64869Q-100000@fledge.watson.org>
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On Thu, Nov 04, 2004 at 09:05:45AM -0500, Robert Watson wrote:
...
> 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... :-)
ok, my turn to say something obvious... lets see...
"I will note that HZ=1000 is ten time higher than HZ=100,"
nah, he just said that; how about this...
"modern CPUs are much faster than older processors"
no, he said that too... hmmmm...
"i don't object to the change"
no, what's the point to speak if i agree... ok i give up, i have
nothing to say on the subject, but one cannot always be serious...
:)
cheers
luigi
> 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.
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> >
>
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