From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 23 Nov 2001 03:48:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 23 Nov 2001 03:48:20 -0500 Received: from mail.pha.ha-vel.cz ([195.39.72.3]:61701 "HELO mail.pha.ha-vel.cz") by vger.kernel.org with SMTP id ; Fri, 23 Nov 2001 03:48:11 -0500 Date: Fri, 23 Nov 2001 09:48:05 +0100 From: Vojtech Pavlik To: safemode Cc: linux-kernel@vger.kernel.org Subject: Re: slowdown on Via ide chipsets with 2.4.15? Message-ID: <20011123094805.A32287@suse.cz> In-Reply-To: <20011122192037Z281458-17408+17489@vger.kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20011122192037Z281458-17408+17489@vger.kernel.org>; from safemode@speakeasy.net on Thu, Nov 22, 2001 at 02:20:31PM -0500 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 22, 2001 at 02:20:31PM -0500, safemode wrote: > something i just took notice while fixing my computers. > hdparm -t to test the speed of drives, i have in the past had about 30MB/s > across all my drives. > Now, my primary disk, which is the only one on it's channel, gets 19MB/s > (udma2 speeds). It's an udma4 drive and i've seen it get 30+ on average in > earlier kernels. My primary master on the promise card gets 30+ still, but > my slave on the same channel gets 19MB/s even though the master is not being > used. I know there is to be expected some performance drop, but that much is > a little disconcerting. I have my atapi devices on the secondary channel of > my via controller (motherboard) and the second channel on the promise card > will be used for my new drive. > The harddrives are configured exactly the way they used to be and the kernel > is compiled with the exact same options for ide/dma and such. The > changefile doesn't look like the via ide drivers were messed with. The only > other difference is that all my drives are now ext3. > > Controller (motherboard) VP_IDE: VIA vt82c686a (rev 22) IDE UDMA66 > controller on pci00:07.1 > Controller (card) PDC20262: (U)DMA Burst Bit ENABLED Primary PCI Mode > Secondary PCI Mode. > > All drives are set to UDMA4 (ATA66) hdparm isn't used, simple check shows > that everything is set the way it should be default. > > Also, the kernel displays UDMA(66) wouldn't it be ATA66. UDMA comes in > 1,2,4, and 5. that's like, ata16, ata33, ata66 and ata100. Send me your /proc/ide/via and hdparm -i /dev/hd*, and I'll see if I see any problems there ... -- Vojtech Pavlik SuSE Labs