From: "HUANG Weller (CM/ESW12-CN)" Subject: which IO-scheduler is best for flash based storage device with ext4 Date: Wed, 13 Jan 2016 06:33:28 +0000 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT To: Jan Kara , "linux-ext4@vger.kernel.org" Return-path: Received: from smtp6-v.fe.bosch.de ([139.15.237.11]:18617 "EHLO smtp6-v.fe.bosch.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751142AbcAMGde convert rfc822-to-8bit (ORCPT ); Wed, 13 Jan 2016 01:33:34 -0500 Content-Language: en-US Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi, Could you tell me which IO-scheduler is best for flash based storage device with ext4 ? Just search from WWW, I saw it is said that the noop is best because the CFQ is design for the mechanical hard disk. And I did the performance test with IOzone between the IO-scheduler noop and cfq. The performance difference is small. So here I want to get some answer from you about this question. Thanks. Huang weller