From: Eric Sandeen Subject: Re: delalloc fragmenting files? Date: Mon, 29 Oct 2007 14:13:27 -0500 Message-ID: <472630D7.4020606@redhat.com> References: <47225B1E.2060708@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: ext4 development Return-path: Received: from mx1.redhat.com ([66.187.233.31]:55303 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752808AbXJ2TN3 (ORCPT ); Mon, 29 Oct 2007 15:13:29 -0400 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.8/8.13.1) with ESMTP id l9TJDSYU018677 for ; Mon, 29 Oct 2007 15:13:28 -0400 Received: from pobox-2.corp.redhat.com (pobox-2.corp.redhat.com [10.11.255.15]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l9TJDSP2030719 for ; Mon, 29 Oct 2007 15:13:28 -0400 Received: from liberator.sandeen.net (sebastian-int.corp.redhat.com [172.16.52.221]) by pobox-2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l9TJDR9i005858 for ; Mon, 29 Oct 2007 15:13:27 -0400 In-Reply-To: <47225B1E.2060708@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Eric Sandeen wrote: > (note: times & rates look wrong to me, something is up with blktrace I > think, but FIBMAP shouldn't lie about allocation) CONFIG_NO_HZ was causing this... here are better graphs: http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write.png http://people.redhat.com/esandeen/seekwatcher/xfs-dd-write.png http://people.redhat.com/esandeen/seekwatcher/ext4-xfs-dd-write.png http://people.redhat.com/esandeen/seekwatcher/ext4-dd-write-odirect.png http://people.redhat.com/esandeen/seekwatcher/xfs-dd-write-odirect.png http://people.redhat.com/esandeen/seekwatcher/ext4-xfs-dd-write-odirect.png -Eric