Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753399AbYKYKoc (ORCPT ); Tue, 25 Nov 2008 05:44:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752608AbYKYKoY (ORCPT ); Tue, 25 Nov 2008 05:44:24 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:49914 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752606AbYKYKoX (ORCPT ); Tue, 25 Nov 2008 05:44:23 -0500 Date: Tue, 25 Nov 2008 05:44:15 -0500 From: Christoph Hellwig To: Justin Piszcz Cc: Eric Sandeen , Stian Jordet , Alan Piszcz , linux-kernel@vger.kernel.org, xfs@oss.sgi.com Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc] Message-ID: <20081125104415.GA17304@infradead.org> References: <1226760254.5089.11.camel@chevrolet> <430c4fa50811180551r67d5d680tf1ffa493604ac4ea@mail.gmail.com> <1227476908.32357.5.camel@chevrolet> <1227485956.5145.10.camel@chevrolet> <1227569808.5039.6.camel@chevrolet> <492B5684.2080107@sandeen.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 945 Lines: 30 On Tue, Nov 25, 2008 at 04:56:24AM -0500, Justin Piszcz wrote: > barriers enabled: > > $ time bash -c 'tar xf linux-2.6.27.7.tar; sync' > block 573932: ** Block of NULs ** > Total bytes read: 293857280 (281MiB, 1.9MiB/s) > > real 2m40.643s > user 0m0.194s > sys 0m1.541s > > barriers disabled: > > time bash -c 'tar xf linux-2.6.27.7.tar; sync' > block 573932: ** Block of NULs ** > Total bytes read: 293857280 (281MiB, 11MiB/s) > > real 0m27.612s > user 0m0.182s > sys 0m1.617s That's worse than usual, and even the no-barriers numbers are still really bad. What kind of disk and controller is this? Did you try to disable the cache with hdparm and see what that gives? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/