Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754091AbZISFkB (ORCPT ); Sat, 19 Sep 2009 01:40:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752753AbZISFkA (ORCPT ); Sat, 19 Sep 2009 01:40:00 -0400 Received: from james.oetiker.ch ([213.144.138.195]:36487 "EHLO james.oetiker.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752719AbZISFj7 (ORCPT ); Sat, 19 Sep 2009 01:39:59 -0400 Date: Sat, 19 Sep 2009 07:40:01 +0200 (CEST) From: Tobias Oetiker To: david@lang.hm cc: linux-kernel@vger.kernel.org Subject: Re: announce: fsopbench - filesystem operations benchmark In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1482 Lines: 47 Yesterday david@lang.hm wrote: > On Fri, 18 Sep 2009, Tobi Oetiker wrote: > > > Hi David, > > > > Today david@lang.hm wrote: > > > > > On Fri, 18 Sep 2009, Tobias Oetiker wrote: > > > > > > > > > > > http://oss.oetiker.ch/optools/wiki/fsopbench > > > > > > > > It shows similar results on all configurations I have tested. > > > > In the example below you see: > > > > > > > > * lstat: 10 times slower > > > > * reading the first byte of a file: 80 times slower > > > > * reading a directory entry: 16 times slower > > > > * read rate: 40 times lower > > > > > > lower and slower than what? > > > > reading on an idle system vs reading on a system where writer > > processees are active ... > > as a user I would expect that a disk that is busy being written to will be > slower to read from. > > what would you expect to happen in this situation? sure, the question is how much slower ... 40 times slower speed and 80 times slower response time is a bit much I would say ... half the speed and half the response time would be what I would expect ... but then thats just me ... cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch tobi@oetiker.ch ++41 62 775 9902 / sb: -9900 -- 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/