From owner-freebsd-current Sun Mar 2 9:55:41 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 8678637B401 for ; Sun, 2 Mar 2003 09:55:40 -0800 (PST) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9B0A943F85 for ; Sun, 2 Mar 2003 09:55:39 -0800 (PST) (envelope-from phk@phk.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.6/8.12.6) with ESMTP id h22HtLA6009065; Sun, 2 Mar 2003 18:55:28 +0100 (CET) (envelope-from phk@phk.freebsd.dk) To: Bruce Evans Cc: "M. Warner Losh" , current@FreeBSD.ORG Subject: Re: Any ideas why we can't even boot a i386 ? From: "Poul-Henning Kamp" In-Reply-To: Your message of "Mon, 03 Mar 2003 04:06:41 +1100." <20030303034332.Y30986-100000@gamplex.bde.org> Date: Sun, 02 Mar 2003 18:55:21 +0100 Message-ID: <9064.1046627721@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 <20030303034332.Y30986-100000@gamplex.bde.org>, Bruce Evans writes: >On Sun, 2 Mar 2003, Bruce Evans wrote: > >> On Fri, 28 Feb 2003, Poul-Henning Kamp wrote: >> >> > My main concern would be if the chips have the necessary "umphf" >> > to actually do a real-world job once they're done running all the >> > overhead of 5.0-R. The lack of cmpxchg8 makes the locking horribly >> > expensive. >> >> Actually, the lack of cmpxchg8 only makes locking more expensive. It's > ^^^^ > >I.e., strictly more expensive, but not much more. Bruce, it is not a matter of the relative expensiveness of the various implementations of locking primitives, its a matter of the cummulative weight of all the locks we add to the system. -- 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