From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:55701 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758157Ab3EWM4C (ORCPT ); Thu, 23 May 2013 08:56:02 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1UfV3n-0006Q4-O7 for linux-btrfs@vger.kernel.org; Thu, 23 May 2013 14:55:59 +0200 Received: from tc-gate1.pci.uni-heidelberg.de ([129.206.21.241]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 23 May 2013 14:55:59 +0200 Received: from bernd.schubert by tc-gate1.pci.uni-heidelberg.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 23 May 2013 14:55:59 +0200 To: linux-btrfs@vger.kernel.org From: Bernd Schubert Subject: raid6: rmw writes all the time? Date: Thu, 23 May 2013 14:55:47 +0200 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi all, we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn't read all the during the writes. Is this a known issue? This is with linux-3.9.2. Thanks, Bernd