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Message-ID: <58cb370e04122707544be6d600@mail.gmail.com>
Date: Mon, 27 Dec 2004 16:54:50 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Reply-To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Andreas Steinmetz <ast@domdv.de>
Subject: Re: Linux 2.6.10-ac1
Cc: Ross Biro <ross.biro@gmail.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, 27 Dec 2004 16:49:00 +0100, Andreas Steinmetz <ast@domdv.de> wrote:
> Bartlomiej Zolnierkiewicz wrote:
> > Workaround it if it is possible.  If this is really a unfixable hardware problem
> > (hard to believe - other OS-es would be also bitten by the issue) shouldn't it
> > be workaround differently anyway by something like "ide=serialize_all" (which
> > is much saner from IDE POV than "idex=serialize") ?
> 
> Bad. This would neatly kill my raid 5 setup performance wise. Call this
> idea a big step sideways. Doing a ide2=serialize leaves all three disks
> running without serialization unless the dvd-rw is used. Just to make it
> clear:
> ide0 -> onboard, 1 master (disk)
> ide1 -> onboard, 1 master (disk)
> ide2/3 -> pci, 2 master (disk,dvd-rw)
> Your idea would serialize all ide accesses which would slow down all
> disks not affected by the problem requiring serialization.

Ah, so the problem only affects native PCI IRQs.
Is it possible that it is a buggy IDE host driver not a generic IDE problem?