From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fabien Salvi Subject: Re: Bad fibre channel performance: need howto Date: Mon, 24 Nov 2003 16:26:47 +0100 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <3FC22337.3020105@cri74.org> References: <1069443458.7047.35.camel@cala> <3FC1E393.4090907@cri74.org> <1069673445.1231.18.camel@cala> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from aravis.cur-archamps.fr ([195.202.0.99]:6312 "EHLO aravis.cur-archamps.fr") by vger.kernel.org with ESMTP id S263763AbTKXP0s (ORCPT ); Mon, 24 Nov 2003 10:26:48 -0500 List-Id: linux-scsi@vger.kernel.org To: Mario Giammarco Cc: linux-scsi@vger.kernel.org Mario Giammarco a =E9crit: > Il lun, 2003-11-24 alle 11:55, Fabien Salvi ha scritto: >=20 >=20 >>Hello Mario, >> >=20 >=20 >=20 >>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 th= eir=20 >>server. >> >>But, it's true, it's a bit old >=20 >=20 > Yes send it to me please. I like to read all. Here : ftp://ftp.cri74.org/incoming/services/3c6caf61efc733e03526edac45852ad1/= fibrechannel_howto.tar.bz2 >>About your problem, I am not sure it's really because of FibreChannel= =2E >>There are a lot of differences between theorical values and real ones= =2E >>Which tool are you using for the benchmark ? >=20 >=20 > I know but usually the "sequential read" is the easiest test to disco= ver > if there are problems. >=20 > 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, et= c. > and usually after tweaking I get performance promised. >=20 > Here there is little to tweak and I then discovered with a serious te= st > (tiobench) that write performance is also worse. >=20 > I suppose there is some problem. >=20 > I am now buying a qlogic2200 to try if it is better. > Can someone tell me best drivers for qlogic2200? I use qlogic 2200 FC HBA with the official qlogic driver and it works=20 fine. Look at:=20 http://www.qlogic.com/support/os_detail.asp?productid=3D113&osid=3D26 --=20 =46abien SALVI Centre de Ressources Informatiques Archamps, France -- http://www.cri74.org PingOO GNU/linux distribution : http://www.pingoo.or= g - To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html