From owner-freebsd-hackers Sun Feb 11 1: 1:22 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from fw.wintelcom.net (ns1.wintelcom.net [209.1.153.20]) by hub.freebsd.org (Postfix) with ESMTP id 8427437B4EC for ; Sun, 11 Feb 2001 01:01:05 -0800 (PST) Received: (from bright@localhost) by fw.wintelcom.net (8.10.0/8.10.0) id f1B90oX17673; Sun, 11 Feb 2001 01:00:50 -0800 (PST) Date: Sun, 11 Feb 2001 01:00:50 -0800 From: Alfred Perlstein To: Greg Black Cc: Matt Dillon , freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance Message-ID: <20010211010050.I3274@fw.wintelcom.net> References: <200102102245.f1AMj1328151@earth.backplane.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from gjb@gbch.net on Sun, Feb 11, 2001 at 05:31:43PM +1000 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG * Greg Black [010210 23:33] wrote: > Matt Dillon wrote: > > > Unless you are doing a read-only mount, there are still going to be > > cases where having softupdates turned on can be advantageous. For > > example, installworld will go a lot faster. I also consider softupdates > > a whole lot safer, even if all you are doing is editing an occassional > > file. > > OK, I'm sold on the general idea of using soft updates; but what > sort of performance improvements should I expect to see? > > I do a kernel compile on a freshly-rebooted box with an without > softupdates; without, it took 20m45s and with soft updates it > still took 20m10s --- this is less than 3% faster, which is > close to statistically insignificant. Is this expected, or is > there some other factor I should look at? > Does 'mount' actually show softupdates as active? If not you need to run 'tunefs' on the partition to set them active. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message