From: Sean McCauliff Subject: Re: High CPU Utilization When Copying to Ext4 Date: Fri, 8 Jul 2011 10:41:13 -0700 Message-ID: <4E174139.4070501@nasa.gov> References: <341DAA96EE3A8444B6E4657BE8A846EA4B3DA126FE@NDJSSCC06.ndc.nasa.gov> <20110627030539.GF3064@thunk.org> <341DAA96EE3A8444B6E4657BE8A846EA4B3DA12708@NDJSSCC06.ndc.nasa.gov> <341DAA96EE3A8444B6E4657BE8A846EA4B3DA1270A@NDJSSCC06.ndc.nasa.gov> <50F503A1-6A16-41C4-9C27-0662063C7817@mit.edu> <4E0BBCE9.9020600@nasa.gov> <20110630023306.GY2729@thunk.org> <4E17398F.2090609@nasa.gov> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Cc: "Ted Ts'o" , "linux-ext4@vger.kernel.org" To: Andi Kleen Return-path: Received: from ndmsnpf01.ndc.nasa.gov ([198.117.0.121]:49430 "EHLO ndmsnpf01.ndc.nasa.gov" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754443Ab1GHRlP (ORCPT ); Fri, 8 Jul 2011 13:41:15 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: 43% of the destination file system is in use. Sean On 07/08/2011 10:17 AM, Andi Kleen wrote: > Sean McCauliff writes: > >> I tried running perf on the copy program on subset of the sparse >> files. It seems like ext4 is the source of high cpu utilization. At >> this point this high cpu utilization is very annoying, but I can live >> with this problem. If you know something simple I could do to >> alleviate this problem I would be most appreciative. At the end of >> this email is a consolidation of information about this problem. >> >> Events: 6M cycles >> -76.80% java [kernel.kallsyms] [k] ext4_mb_good_group >> - ext4_mb_good_group > > Is your file system too full? > > A lot of file system get inefficient in allocating blocks when the > file system is nearly full. > > -Andi >