From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 6 Aug 2002 11:08:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 6 Aug 2002 11:08:39 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:52447 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id ; Tue, 6 Aug 2002 11:08:37 -0400 Date: Tue, 6 Aug 2002 17:12:05 +0200 From: Jens Axboe To: Marc-Christian Petersen Cc: linux-kernel@vger.kernel.org, Marcelo Tosatti , Adrian Bunk Subject: Re: 2.4.19' drivers/block/ll_rw_blk.c Message-ID: <20020806151205.GD1132@suse.de> References: <200208051223.29329.mcp@linux-systeme.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200208051223.29329.mcp@linux-systeme.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 05 2002, Marc-Christian Petersen wrote: > Hi there, > > could you please consider changing those very slow behaviour in > "drivers/block/ll_rw_blk.c"? ... Benchmarked against 2.4.18 this is horribly > slower ... Doing some heavy disk i/o, want to start another thing, system > freeze for some seconds ... Opening a xterm , Ctrl-D to leave, this takes > about 5 seconds and somewhat is doing flushing to the disk. > > Maybe req_finished_io ? > > Adrian, could this be the problem you've experienced? This is a crazy bug report, sorry :-) What slow behaviour in ll_rw_blk.c?! Consider providing vmstat when the slowdown takes place. Also, try enable profiling if it seems like hard system freezes. > Afaik this was changed for 2.4.19-pre7 and above. 2.4.19-pre7 works fine, 2.4.19-pre8 stinks? -- Jens Axboe