HZ kernel option
jason at ec.rr.com
Mon Nov 22 21:21:59 PST 2004
Chad Leigh -- Shire.Net LLC wrote:
> 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
> # 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???
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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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