Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965164AbWJBRkt (ORCPT ); Mon, 2 Oct 2006 13:40:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965167AbWJBRkt (ORCPT ); Mon, 2 Oct 2006 13:40:49 -0400 Received: from mx1.redhat.com ([66.187.233.31]:55430 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S965164AbWJBRks (ORCPT ); Mon, 2 Oct 2006 13:40:48 -0400 Date: Mon, 2 Oct 2006 13:40:39 -0400 From: Dave Jones To: Alan Cox Cc: Trond Myklebust , Tim Chen , "Ananiev, Leonid I" , Linux Kernel Mailing List Subject: Re: Postal 56% waits for flock_lock_file_wait Message-ID: <20061002174039.GA17764@redhat.com> Mail-Followup-To: Dave Jones , Alan Cox , Trond Myklebust , Tim Chen , "Ananiev, Leonid I" , Linux Kernel Mailing List References: <1159723092.5645.14.camel@lade.trondhjem.org> <3282373b0610020957u739392eekf8b78c7574e1a6e7@mail.gmail.com> <1159809081.5466.3.camel@lade.trondhjem.org> <1159811516.8907.38.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1159811516.8907.38.camel@localhost.localdomain> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1234 Lines: 29 On Mon, Oct 02, 2006 at 06:51:56PM +0100, Alan Cox wrote: > Ar Llu, 2006-10-02 am 13:11 -0400, ysgrifennodd Trond Myklebust: > > Ext3 does not use flock() in order to lock its journal. The performance > > issues that he is seeing may well be due to the journalling, but that > > has nothing to do with flock_lock_file_wait. > > The ext3 journal also generally speaking improves many-writer > performance as do the reservations so the claim seems odd on that basis > too. Rerun the test on a gigabyte iRam or similar and you'll see where > the non-media bottlenecks actually are "or similar" maybe. The iRam is pretty much junk in my experience[*]. It rarely survives a mkfs, let alone sustained high throughput I/O. (And yes, I did try multiple DIMMs, including ones which survive memtest86 just fine). Another "Boots Windows, ship it" QA disaster afaics. Dave [*] And from googling/talking with other owners, my experiences aren't unique. -- http://www.codemonkey.org.uk - 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/