From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030473AbWIMBTQ (ORCPT ); Tue, 12 Sep 2006 21:19:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030474AbWIMBTP (ORCPT ); Tue, 12 Sep 2006 21:19:15 -0400 Received: from 207-71-50-114.static.twtelecom.net ([207.71.50.114]:49884 "HELO mail.ticom-geo.com") by vger.kernel.org with SMTP id S1030473AbWIMBTO (ORCPT ); Tue, 12 Sep 2006 21:19:14 -0400 Message-ID: <45075C6A.6040808@ticom-geo.com> Date: Tue, 12 Sep 2006 20:18:34 -0500 From: Rudy Klinksiek User-Agent: Mozilla Thunderbird 1.0.7 (Windows/20050923) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: ext2/ext3 balancing streaming io - help Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi: Don't know if this is the right list, if not I apologize and ask someone to point me to right mailing list. For 2.4.27 with low-latency patches, is there a way to balance data streaming in ( around 4-8Mb/sec )with writing it to disk, using an ext2 or ext3 filesystem. The system has a single disk, and can sustain 10-20MB/sec for 2-4 secs. And yes I'm stuck with this particular system. Twiddling with bdflush parameters, I had a setup that was doing this ( monitoring with "vmstat 1" ) but it is not really reproducible. Mostly, data is flushed out in chunks, often 1/2/3 secs with nothing written in between flushes. Eventually freemem is depleted, with cache increasing, but the rate going out to disk is still generally less than the ncoming rate. After shutting down the input side, it takes many 10's of secs for vmstat to show nothing going to disk. "bdflush" doesn't seem to have enough/correct knobs to effect a "streaming" mode. Or am I missing something here? Any other tunable parameters? Any help appreciated klink