From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966801Ab0B0BMJ (ORCPT ); Fri, 26 Feb 2010 20:12:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42395 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966723Ab0B0BMH (ORCPT ); Fri, 26 Feb 2010 20:12:07 -0500 Message-ID: <4B887160.2090606@redhat.com> Date: Fri, 26 Feb 2010 19:12:00 -0600 From: Eric Sandeen User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812) MIME-Version: 1.0 To: Justin Piszcz CC: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Piszcz Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes? References: <4B886CA1.9050906@redhat.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Justin Piszcz wrote: ... >> Were the filesystems created to align with raid geometry? > Only default options were used except the mount options. If that is the > culprit, I have some more testing to do, thanks, will look into it. > >> >> mkfs.xfs has done that forever; mkfs.ext4 only will do so (automatically) >> with recent kernel+e2fsprogs. > How recent? You're recent enough. :) mkfs.ext4 output should include the stripe info if it was found. printf(_("Block size=%u (log=%u)\n"), fs->blocksize, s->s_log_block_size); printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize, s->s_log_frag_size); printf(_("Stride=%u blocks, Stripe width=%u blocks\n"), s->s_raid_stride, s->s_raid_stripe_width); printf(_("%u inodes, %llu blocks\n"), s->s_inodes_count, ext2fs_blocks_count(s)); etc. -Eric