Date: Thu, 12 Nov 1998 14:02:10 -0600 (CST) From: Shafia Kausar <s0k9955@unix.tamu.edu> To: Daniel Eischen <eischen@vigrid.com> Cc: luigi@labinfo.iet.unipi.it, s0k9955@unix.tamu.edu, freebsd-hackers@FreeBSD.ORG, mike@smith.net.au, shafiak@ee.tamu.edu Subject: Re: Timer Granularity Message-ID: <Pine.SOL.3.96.981112135514.14497A-100000@scully.tamu.edu> In-Reply-To: <199811121807.NAA17224@pcnet1.pcnet.com>
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> > > I need a kernel clock of granularity 1ms or less, for some experiments. > > > Which version of FreeBsd supports this granularity, other than the 3.0 > > > version? > > > > > > There is a mention of the resolution depending on the clock > > > sources in use. Which source gives me the best resolution?? > > > > settin HZ=1000 or more in the kernel config file should do the job (if > > you go too high you might start losing ticks...) > > > > luigi > > I set HZ to 500 just a couple of days ago on a 1-2 month old > -current system without too many hiccups. There still are > a few places in the kernel that need to be fixed to use hz > properly, though. sysbeep is one. Grep'ing for all the > timeout()s and ensuring proper use of hz is a start. > Can I set the value of HZ in the 2.1.5 version? I believe the granularity of the clock in this version is 10ms. Does changing the value of HZ change the granularity? If yes, then why is the granularity specified as 10ms?? Thanks -Shafia To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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