Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752952AbYKYJ4e (ORCPT ); Tue, 25 Nov 2008 04:56:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752464AbYKYJ40 (ORCPT ); Tue, 25 Nov 2008 04:56:26 -0500 Received: from lucidpixels.com ([75.144.35.66]:45629 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752320AbYKYJ4Z (ORCPT ); Tue, 25 Nov 2008 04:56:25 -0500 Date: Tue, 25 Nov 2008 04:56:24 -0500 (EST) From: Justin Piszcz To: Eric Sandeen cc: Stian Jordet , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Alan Piszcz Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc] In-Reply-To: <492B5684.2080107@sandeen.net> Message-ID: 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> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1831 Lines: 56 On Mon, 24 Nov 2008, Eric Sandeen wrote: > Stian Jordet wrote: >> ma., 24.11.2008 kl. 04.50 -0500, skrev Justin Piszcz: >>> While there still may be something else wrong, the first problem I see is >>> your sunit and swidth are set to 0. >>> >>> Please read, a good article on what they are and how to set them: >>> http://www.socalsysadmin.com/ >> >> Oh, this was new to me. But the setting didn't change anything. I can >> copy one large file between the xfs and ext3 disk (both ways), and I get >> speeds between 160 and 200 MB/s. But unpacking the kernel source takes >> between 5 and 10 minutes on the xfs disk, and a mere 15 seconds on the >> ext3... (and it also used to take between 5 and 10 minutes when I had >> xfs on the raid0, so it doesn't seem to be hardware related...) >> >> If anyone has anything more I can try before I do the lengthy process of >> backup 1TB, reformat and restore... > > I don't know if the storage you're on passes barriers or not, but xfs > has barriers on by default, while ext3 does not. ext3 will still likely > win the "untar a kernel" race, but for a fairer test, make the barrier > settings consistent between the two. > > -Eric > 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 -- 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/