Date: Thu, 05 Sep 2002 07:02:07 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "M. Warner Losh" <imp@bsdimp.com> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 elan-mmcr.c Message-ID: <13904.1031202127@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 04 Sep 2002 18:43:49 MDT." <20020904.184349.68159448.imp@bsdimp.com>
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In message <20020904.184349.68159448.imp@bsdimp.com>, "M. Warner Losh" writes: >In message: <200209041952.g84JqHZG022386@freefall.freebsd.org> > Poul-Henning Kamp <phk@FreeBSD.org> writes: >: The downside is that HZ=100 is not enough, 150 or more recommended, >: I use 250 myself. > >Why is that the case? It seems kinda counter intuitive to me... The counter is 16 bits running at (33.333 MHz / 4) so it rolls over (3333333 / 4) / 65536 = 127 times a second. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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