From owner-freebsd-current Tue Mar 18 10:49:19 2003 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 76E7F37B401 for ; Tue, 18 Mar 2003 10:49:18 -0800 (PST) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6993D43F85 for ; Tue, 18 Mar 2003 10:49:17 -0800 (PST) (envelope-from phk@phk.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.8/8.12.8) with ESMTP id h2IIn9Yl080739; Tue, 18 Mar 2003 19:49:09 +0100 (CET) (envelope-from phk@phk.freebsd.dk) To: Wilko Bulte Cc: Kevin Oberman , Craig Rodrigues , David Malone , sjh@zorak.net, freebsd-current@FreeBSD.ORG Subject: Re: Clock running double time From: "Poul-Henning Kamp" In-Reply-To: Your message of "Tue, 18 Mar 2003 19:33:05 +0100." <20030318193305.B40906@freebie.xs4all.nl> Date: Tue, 18 Mar 2003 19:49:09 +0100 Message-ID: <80738.1048013349@critter.freebsd.dk> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In message <20030318193305.B40906@freebie.xs4all.nl>, Wilko Bulte writes: >On Tue, Mar 18, 2003 at 07:23:48PM +0100, Poul-Henning Kamp wrote: >> In message <20030318182207.C8DF95D07@ptavv.es.net>, "Kevin Oberman" writes: >> >> >> kern.timecounter.hardware=TSC >> > >> >Can someone explain why TSC is preferred to i8254 (or why not)? >> >> Cheaper access & better resolution. > >Which brings me to the question if there is a comprehensive story >on timekeeping in FreeBSD in the docs? Like the EuroBSDcon2002 >one, but with answers to questions like the one above added. The paper I wrote for EuroBSDCon was as comprehensive as I had time to make it. I am sure I could bore people out of their collective wits talking about my timekeeping experiments, and I have no idea what things people are really interested in, so my best suggestion is for people to ask question, and then collect the answers into a FAQ somewhere in the doc section. -- 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 freebsd-current" in the body of the message