Date: Tue, 23 Nov 2004 00:24:15 -0500 From: jason <jason@ec.rr.com> To: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> Cc: FreeBSD questions list <freebsd-questions@freebsd.org> Subject: Re: HZ kernel option Message-ID: <41A2C97F.9020109@ec.rr.com> In-Reply-To: <20F05A1A-3CDE-11D9-BC47-003065A70D30@shire.net> References: <20F05A1A-3CDE-11D9-BC47-003065A70D30@shire.net>
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Chad Leigh -- Shire.Net LLC wrote: > Hi > > Ok, I am trying to get a feel for the "HZ" option in the 5.3 > (RELENG_5) kernel config. > > # The granularity of operation is controlled by the kernel option HZ > whose > # default value (100) means a granularity of 10ms (1s/HZ). > options HZ=100 > > For a machine that is running as a server, running apache, roxen, > exim, php, some java (server stuff), perl, and then ssh command line > stuff, what is a general recommendation for this parameter? One of > the docs mentions that for some network stuff like dummynet, > increasing this (making the quantum slice smaller) can give better > performance. Can that be extrapolated to general network server stuff > like apache, roxen, exim, etc? > > What have people found out in playing with this??? > > Thanks > Chad > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > The default is now 1000. If you are using this for device polling, 1000 is what you want for 100mb, 10000 for 1gb.
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