Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754378Ab3DPGt5 (ORCPT ); Tue, 16 Apr 2013 02:49:57 -0400 Received: from plane.gmane.org ([80.91.229.3]:38965 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752947Ab3DPGt4 (ORCPT ); Tue, 16 Apr 2013 02:49:56 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: "lkml@tigusoft.pl" Subject: Re: Very poor latency when using hard drive (raid1) Date: Tue, 16 Apr 2013 08:49:33 +0200 Organization: tigusoft.pl Message-ID: References: Reply-To: lkml@tigusoft.pl Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: bolobolo2.torservers.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20121215 Icedove/3.0.11 In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1022 Lines: 23 On 15/04/13 11:59, lkml@tigusoft.pl wrote: > There are 2 hard drives (normal, magnetic) in software raid 1 > on 3.2.41 kernel. > > When I write into them e.g. using dd from /dev/zero to a local file > (ext4 on default settings), running 2 dd at once (writing two files) it > starves all other programs that try to use the disk. > > Running ls on any directory on same disk (same fs btw), takes over half > minute to execute, same for any other disk touching action. > > Did anyone seen such problem, where too look, what to test? > > What could solve it (other then ionice on applications that I expect to > use hard drive)? I got reply (by e-mail) suggesting to use XFS. Thanks, possible for other/next server. But I fell this should work correctly as well on ext4. -- 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/