Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262298AbTFDAvM (ORCPT ); Tue, 3 Jun 2003 20:51:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262437AbTFDAvM (ORCPT ); Tue, 3 Jun 2003 20:51:12 -0400 Received: from astound-64-85-224-253.ca.astound.net ([64.85.224.253]:22542 "EHLO master.linux-ide.org") by vger.kernel.org with ESMTP id S262298AbTFDAvK (ORCPT ); Tue, 3 Jun 2003 20:51:10 -0400 Date: Tue, 3 Jun 2003 17:53:19 -0700 (PDT) From: Andre Hedrick To: Alan Cox cc: Mauk van der Laan , Linux Kernel Mailing List Subject: Re: siimage slow on 2.4.21-rc6-ac2 In-Reply-To: <1054678794.9233.76.camel@dhcp22.swansea.linux.org.uk> Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1969 Lines: 62 NO, it is not irrelevant. Seagate and Silicon Image are the only two player (well intel now) who did their own PHY. They did not use the Marvel pairs. It is a function of possible ECC on the wire and the relation to the segments in the PIO or SG operations. It is a FIFO issue based on 512byte boundaries being breached on corner cases. The data on the wire is in 8K units. It is a 7.5K + 0.5K corner case. max_kb_per_request:15 == 7.5K This prevents this corner case until I can code the proper special case SG table. drive->id->hwconfig |= 0x6000; Is needed to fake the driver for device side cable detect. There are several issues and I have not had time to keep up. I have to do other business ventures because being an independent developer/contract no longer can pay the bills. More proof that free drivers and free software still has a cost to somebody. Cheers, On 3 Jun 2003, Alan Cox wrote: > On Maw, 2003-06-03 at 23:48, Mauk van der Laan wrote: > > He! I just did > > > > # hdparm -d1 -X66 /dev/hdX > > # echo "max_kb_per_request:15" > /proc/.ide/hdX/settings > > > > on BOTH sata drives and everything works fine! > > Is it possible that they influence each other? > > Not as I understand it, but this is rather useful information. The SI > does have some ties for PIO mode but not UDMA clocking. This is most > interesting information. > > The max_kb_per thing should be irrelevant btw. > > - > 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/ > Andre Hedrick LAD Storage Consulting Group - 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/