From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Mon, 02 Jul 2007 06:02:04 -0700 (PDT) Received: from larry.melbourne.sgi.com (larry.melbourne.sgi.com [134.14.52.130]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with SMTP id l62D1xtL024696 for ; Mon, 2 Jul 2007 06:02:01 -0700 Date: Mon, 2 Jul 2007 23:01:50 +1000 From: David Chinner Subject: Re: After reboot fs with barrier faster deletes then fs with nobarrier Message-ID: <20070702130150.GK989688@sgi.com> References: <20070629001648.GD31489@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: Szabolcs Illes Cc: xfs@oss.sgi.com On Fri, Jun 29, 2007 at 01:01:36PM +0100, Szabolcs Illes wrote: > on my desktop pc: > > WCE=1 hot-cache/cold cache nobarrier is faster. same results as I got. After reboot, nobarrier is way slow. > WCE=0 hot-cache/cold-cache is pretty much identical. Same results I got. After reboot, nobarrier is way slow. > for cold cache I used: echo 3 > /proc/sys/vm/drop_caches Same here. > it looks like this machine is only affected after reboot, maybe the hdd > has more cache, then the hdd in my 3 years old laptop. > on my laptop it was enought to clear the kernel cache. > > How did you do your "cold" tests? reboot or drop_caches? drop_caches. So there definitely appears to be something about a reboot that is causing an issue here. I'll see if I can reproduce it here. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group