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Date: Thu, 4 Nov 2004 06:15:23 -0800
From: Luigi Rizzo <rizzo@icir.org>
To: Robert Watson <rwatson@freebsd.org>
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References: <39210.1099557885@critter.freebsd.dk>
	<Pine.NEB.3.96L.1041104090425.64869Q-100000@fledge.watson.org>
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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
cc: arch@freebsd.org
cc: Poul-Henning Kamp <phk@phk.freebsd.dk>
Subject: Re: HEADSUP:  HZ=1000 by default on i386
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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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