On Fri, 12 Jan 2001, Linus Torvalds wrote:
> Date: Fri, 12 Jan 2001 16:52:00 -0800 (PST)
> From: Linus Torvalds <[EMAIL PROTECTED]>
> To: John Heil <[EMAIL PROTECTED]>
> Cc: Alan Cox <[EMAIL PROTECTED]>, Vojtech Pavlik <[EMAIL PROTECTED]>,
> [EMAIL PROTECTED]
> Subject: Re: ide.2.4.1-p3.01112001.patch
>
>
>
> On Fri, 12 Jan 2001, John Heil wrote:
>
> > On Sat, 13 Jan 2001, Alan Cox wrote:
> >
> > > Date: Sat, 13 Jan 2001 00:25:28 +0000 (GMT)
> > > From: Alan Cox <[EMAIL PROTECTED]>
> > > To: Linus Torvalds <[EMAIL PROTECTED]>
> > > Cc: Vojtech Pavlik <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
> > > Subject: Re: ide.2.4.1-p3.01112001.patch
> > >
> > > > what the bug is, and whether there is some other work-around, and whether
> > > > it is 100% certain that it is just those two controllers (maybe the other
> > > > ones are buggy too, but the 2.2.x tests basically cured their symptoms too
> > > > and peopl ehaven't reported them because they are "fixed").
> > >
> > > I've not seen reports on the later chips. If they had been buggy and then
> > > fixed I'd have expected much unhappy ranting before the change
> >
> > The "fix" was an hdparm command like hdparm -X66 -m16c1d1 /dev/hda.
> > Which I set for my VIA 686a on a Tyan mobo w a 1G Athlon.
>
> Careful. It may be that your fix just avoids the corruption because the
> other changes make it ok - like the 16-sector multi-count thing maybe
> hides a problem that might still exist - it just changes the "normal"
> timing so that you won't ever see it in practice any more.
>
> These kinds of magic interactions is why I'm not at all happy about driver
> changes until people really know what it was that caused it, and _know_
> that it's gone.
>
> Anyway, for you the problem apparently happened even on a 686a, but just
> the 586 series. Correct?
Yes, initially the 686a was problematic, now with an 80 wire cable its
fine.
One point of clarification... I started out with a simple hdparm -d1
which failed 85% of the time. I added the other stuff only to enhance the
-d0 state I was left with.
I then changed to the 80 wire cables and retried with only -d1 again,
and to my surprise, the problems never came back and DMA stayed on.
A while later, I added -X66 and it too worked great. Then lastly came
the re-add of the rest giving current state.
>
> Linus
>
-----------------------------------------------------------------
John Heil
South Coast Software
Custom systems software for UNIX and IBM MVS mainframes
1-714-774-6952
[EMAIL PROTECTED]
[EMAIL PROTECTED]
http://www.sc-software.com
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