Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 14 Apr 2001 03:05:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 14 Apr 2001 03:04:52 -0400 Received: from npt12056206.cts.com ([216.120.56.206]:47113 "HELO forty.greenhydrant.com") by vger.kernel.org with SMTP id ; Sat, 14 Apr 2001 03:04:40 -0400 Date: Sat, 14 Apr 2001 00:04:33 -0700 From: David Rees To: linux-kernel@vger.kernel.org Subject: Re: SW-RAID0 Performance problems Message-ID: <20010414000433.F4557@greenhydrant.com> Mail-Followup-To: David Rees , linux-kernel@vger.kernel.org In-Reply-To: <01041317365500.00665@debian> <20010413090751.E4557@greenhydrant.com> <01041318282003.00665@debian> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <01041318282003.00665@debian>; from ujq7@rz.uni-karlsruhe.de on Fri, Apr 13, 2001 at 06:28:20PM +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 13, 2001 at 06:28:20PM +0200, Andreas Peter wrote: > Am Freitag, 13. April 2001 18:07 schrieb David Rees: > > > Cconfig and setup looks OK. > > > > What happens if your run hdparm -t /dev/hda and /dev/hdc at the same time? > > Good idea! > The performance is only ~11MB/sec per disk > There is a bottleneck somewhere... OK, so it's not the RAID setup. There's two things that can cause this. One is that DMA is turned off (what does hdparm /dev/hda and hdparm /dev/hdc show?), the second was that the drives are on the same channel (which obviously isn't the case here). Can you verify that the drives are in DMA mode? -Dave - 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/