HEADSUP: HZ=1000 by default on i386
Robert Watson
rwatson at freebsd.org
Thu Nov 4 06:06:45 PST 2004
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 at 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 at 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 at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-arch
> To unsubscribe, send any mail to "freebsd-arch-unsubscribe at freebsd.org"
>
More information about the freebsd-arch
mailing list