Date: Wed, 24 Jan 2001 07:12:27 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: Thierry.Herbelot@alcatel.fr Cc: stable@FreeBSD.ORG Subject: Re: Running with very high HZ ? Message-ID: <20010124071227.K52423@gsmx07.alcatel.com.au> In-Reply-To: <C12569DD.003C74B5.00@frmta003.netfr.alcatel.fr>; from Thierry.Herbelot@alcatel.fr on Tue, Jan 23, 2001 at 12:00:17PM %2B0100 References: <C12569DD.003C74B5.00@frmta003.netfr.alcatel.fr>
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On 2001-Jan-23 12:00:17 +0100, Thierry.Herbelot@alcatel.fr wrote: >more precisely : is it ok to run a recent PC (P-III + BX chipset) with >HZ=5000 ? There may be a problem with integer overflow in some tape timeout calculations at very high HZ rates. (There was a reference to it on freebsd-current recently). Other than that I don't know of any problems, though Alfred Perlstein <bright@wintelcom.net> mentioned (in mid-January) that he knew of someone who had had problems that went away when he changed HZ back to 100 - unfortunately he doesn't have any other details. I have a P-133 and a PIII-600 both running with HZ=2000 to provide reasonable accuracy with small dummynet delays. Even on the P-133, there's still negligible system/interrupt load as a result. Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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