Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262874AbTE0SGN (ORCPT ); Tue, 27 May 2003 14:06:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264071AbTE0R4c (ORCPT ); Tue, 27 May 2003 13:56:32 -0400 Received: from lindsey.linux-systeme.com ([80.190.48.67]:27142 "EHLO mx00.linux-systeme.com") by vger.kernel.org with ESMTP id S264063AbTE0R4G (ORCPT ); Tue, 27 May 2003 13:56:06 -0400 From: Marc-Christian Petersen Organization: Working Overloaded Linux Kernel To: Marcelo Tosatti , Andrea Arcangeli Subject: Re: 2.4.20: Proccess stuck in __lock_page ... Date: Tue, 27 May 2003 20:08:43 +0200 User-Agent: KMail/1.5.2 Cc: linux-kernel@vger.kernel.org, Carl-Daniel Hailfinger , manish , Christian Klose , William Lee Irwin III References: <3ED2DE86.2070406@storadinc.com> <200305271952.34843.m.c.p@wolk-project.de> In-Reply-To: MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200305272004.02376.m.c.p@wolk-project.de> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1252 Lines: 33 On Tuesday 27 May 2003 19:57, Marcelo Tosatti wrote: Hi Marcelo, > > I do, people I know do also, numbers of those people only _I_ know are > > about ~30. I've reported this problem over a year ago while 2.4.19-pre > > time. > Can you please try to reproduce it with -aa? not again ;) I've tried almost all known kernel tree's around, every kernel has the same effect. I even tried SuSE and Redhat Kernels. I've 'wasted' tons of time just find a solution for it. Andrea introduced, to address _exact_ this problem (pauses, stops, mouse is dead etc.), his lowlatency elevator. Side effect: decreases i/o throughput, and the "pauses/stops" are still there. Much less but not gone. The _only_ workaround yet (known to the public) is to change nr_requests in drivers/block/ll_rw_blk.c from 128 to 4 which gives a performance hit of about 40% (not acceptable in any way). .oO( I am quite sure I've mailed you all this stuff privately in response to your private mail to me ;) )Oo. ciao, Marc - 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/