Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933674AbbBDJvH (ORCPT ); Wed, 4 Feb 2015 04:51:07 -0500 Received: from q.xf.ee ([89.221.70.14]:43655 "EHLO q.xf.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933616AbbBDJvD (ORCPT ); Wed, 4 Feb 2015 04:51:03 -0500 Date: Wed, 4 Feb 2015 11:50:58 +0200 (EET) From: Siim Vahtre To: Purush Gupta cc: Linux Kernel Mailing List , Linux SCSI List Subject: Re: sequential I/O on SSD disk varies from 20 to 300 MBytes/s every week In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 864 Lines: 25 > Since you mentioned problem does not happen on Windows, what do you use > to emulate the workload (iometer ?) CrystalDiskMark, HD Tune, ATTO Disk Benchmark Tested for 2-3 hours, but got stable results. Directly afterwards booted Live CD with Linux and immediately got poor results. > and did you see the same behaviour with other Kernel versions like > 2.6.32. I did not test this, as this kernel version wouldn't work for me anyway. If you think it would be very important datapoint, I can try. > You may want to check the per device queue configuration, lsscsi -L "queue_depth=256", same for all disks -- 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/