From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Giammarco Subject: Re: Bad fibre channel performance: need howto Date: Mon, 24 Nov 2003 12:30:45 +0100 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <1069673445.1231.18.camel@cala> References: <1069443458.7047.35.camel@cala> <3FC1E393.4090907@cri74.org> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from vsmtp4.tin.it ([212.216.176.224]:53890 "EHLO vsmtp4.tin.it") by vger.kernel.org with ESMTP id S263745AbTKXLaz (ORCPT ); Mon, 24 Nov 2003 06:30:55 -0500 In-Reply-To: <3FC1E393.4090907@cri74.org> List-Id: linux-scsi@vger.kernel.org To: Fabien Salvi Cc: linux-scsi@vger.kernel.org Il lun, 2003-11-24 alle 11:55, Fabien Salvi ha scritto: > Hello Mario, > > If you want, I can send you an archive of the howto. > I've downloaded it a long time ago, before sistina removed it from their > server. > > But, it's true, it's a bit old Yes send it to me please. I like to read all. > About your problem, I am not sure it's really because of FibreChannel. > There are a lot of differences between theorical values and real ones. > Which tool are you using for the benchmark ? I know but usually the "sequential read" is the easiest test to discover if there are problems. I have used hdparm and sg3 tools to do a quick sequential read test. On ide world if hdparm tells me that I have sequential transfer rate lower than shown on web reviews it means that I have to tweak dma, etc. and usually after tweaking I get performance promised. Here there is little to tweak and I then discovered with a serious test (tiobench) that write performance is also worse. I suppose there is some problem. I am now buying a qlogic2200 to try if it is better. Can someone tell me best drivers for qlogic2200? Thanks again! -- Mario Giammarco