Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965377AbXATUcL (ORCPT ); Sat, 20 Jan 2007 15:32:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965369AbXATUcL (ORCPT ); Sat, 20 Jan 2007 15:32:11 -0500 Received: from 1wt.eu ([62.212.114.60]:2097 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965377AbXATUcK (ORCPT ); Sat, 20 Jan 2007 15:32:10 -0500 Date: Sat, 20 Jan 2007 21:31:41 +0100 From: Willy Tarreau To: Tim Schmielau Cc: Ismail =?iso-8859-1?Q?D=F6nmez?= , linux-kernel@vger.kernel.org Subject: Re: Abysmal disk performance, how to debug? Message-ID: <20070120203140.GE25307@1wt.eu> References: <200701201920.54620.ismail@pardus.org.tr> <200701201952.54714.ismail@pardus.org.tr> <200701202216.16637.ismail@pardus.org.tr> <20070120201923.GC25307@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 900 Lines: 25 On Sat, Jan 20, 2007 at 09:28:57PM +0100, Tim Schmielau wrote: > On Sat, 20 Jan 2007, Willy Tarreau wrote: > > > Anyway, in your situation with a very small buffer, this should not > > change by more than half a second or so. > > Well, his buffer is not small. He has half a GB of RAM, so when > writing 1 GB the buffer would roughly double the dd speed, exactly as he > has shown us. yes, but he sees the opposite : when using half of the memory for the buffer, he has low speed. When shorting cache size to 2% only, he doubles his speed. > Anyways, instead of always just posting similar answers to yours, I'll > have dinner now. :-) :-) Willy - 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/