From owner-freebsd-stable Sat Feb 19 1:54:48 2000 Delivered-To: freebsd-stable@freebsd.org Received: from peak.mountin.net (peak.mountin.net [207.227.119.2]) by hub.freebsd.org (Postfix) with ESMTP id B391337BBC1 for ; Sat, 19 Feb 2000 01:54:45 -0800 (PST) (envelope-from jeff-ml@mountin.net) Received: (from daemon@localhost) by peak.mountin.net (8.9.1/8.9.1) id DAA08438; Sat, 19 Feb 2000 03:54:43 -0600 (CST) (envelope-from jeff-ml@mountin.net) Received: from dial-82.max1.wa.cyberlynk.net(207.227.118.82) by peak.mountin.net via smap (V1.3) id sma008430; Sat Feb 19 03:54:19 2000 Message-Id: <3.0.3.32.20000219035342.009ce460@207.227.119.2> X-Sender: jeff-ml@207.227.119.2 X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.3 (32) Date: Sat, 19 Feb 2000 03:53:42 -0600 To: Tom From: "Jeffrey J. Mountin" Subject: Re: Initial performance testing w/ postmark & softupdates... Cc: stable@FreeBSD.ORG In-Reply-To: References: <38ACAF8B.65E314E9@newsguy.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG At 03:08 PM 2/18/00 -0800, Tom wrote: >On Fri, 18 Feb 2000, Daniel C. Sobral wrote: > >> Tom wrote: >> > >> > Not really. You could just use async updates instead of softupdates. >> > Or an OS that uses async updates. Write caching metadata is always faster >> > than re-ordering it intelligently. >> >> Softupdates reduces the number of writes needed. It can coalesce writes >> to the same block. > > Async updates are always as fast as softupdates, if not faster. You >should read the softupdates docs. As fast, but not safer. Can't recall the entire analogy, but Terry mentioned on -hacker a long time back something to the effect that softupdates is like having a seatbelt and an airbag rather than just a seatbelt, as well as a faster car too. Jeff Mountin - jeff@mountin.net Systems/Network Administrator FreeBSD - the power to serve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message