Date: Tue, 5 Apr 2005 11:08:45 +0200 From: Emanuel Strobl <emanuel.strobl@gmx.net> To: freebsd-questions@freebsd.org Cc: cpghost@cordula.ws Subject: Re: HZ=1000 ? Message-ID: <200504051109.01670@harrymail> In-Reply-To: <4251C915.1000009@cloudview.com> References: <20050404091719.GA9748@lothlorien.nagual.st> <20050404093755.GA48928@epia2.farid-hajji.net> <4251C915.1000009@cloudview.com>
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[-- Attachment #1 --] Am Dienstag, 5. April 2005 01:09 schrieb John Pettitt: > cpghost@cordula.ws wrote: > >Interestingly, HZ=100 has remained constant for decades (!), despite > >CPUs getting faster all the time. This is an excellent value for most > >typical usage patterns. Cranking it up should only be required for > >special cases. Anyway, the HZ knob is there. Experiment with it until > >you get optimal performance. > > In the dim and distant past (like 1983) some systems used HZ=50 or HZ=60 > depending on where in the world they were. I used an MP/M based box > that took it's clock tick from the power line (no good RTC hardware Hmm, I've seen onboard RTCs which surely were less acurate than a power-line-driven oscillator was ;) Some RTCs are really bad. But at least here in germany power line frequency is astonishing acurate. We also have a broadcast station which generates it's 50Hz vertical refresh rate from a dedicated caesium clock. Of course this tv station is paid by the peoples.... Sorry, a bit OT, but I'm really impressed how constant power line frequency is. -Harry > available but the power company keeps pretty good time). > > John > _______________________________________________ > 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" [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQBCUlWtBylq0S4AzzwRAinhAKCNCE+ruXGU6hYWrDvYBg71ngVPRwCdFCn0 7Xm5jfUxZiUhwRPKMY61qzw= =Yi52 -----END PGP SIGNATURE-----
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