Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964967AbbBBOJG (ORCPT ); Mon, 2 Feb 2015 09:09:06 -0500 Received: from q.xf.ee ([89.221.70.14]:60801 "EHLO q.xf.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932206AbbBBOJD (ORCPT ); Mon, 2 Feb 2015 09:09:03 -0500 Date: Mon, 2 Feb 2015 16:08:53 +0200 (EET) From: Siim Vahtre To: Suman Tripathi 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: 599 Lines: 13 > Please check whether write cache is enabled in the drive > also check whether NCQ is enabled or not. About caches please note quote from my e-mail below. Changing NCQ enabled/disabled had no effect either. >> 6) It is not a caching issue (controller/disk caches were off during >> testing, but even putting them on had minor impact on the results) -- 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/