Messages in this thread |  | | | Date | Tue, 28 Jul 1998 20:16:09 -0400 | | From | Mark Lord <> | | Subject | Re: 2.1.111: IDE DMA disabled? |
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Linus Torvalds wrote: ... > And yes, he couldn't reproduce it at will without SMP. Which may mean that > there is a SMP problem, but is equally likely to mean that with SMP
Duh. Letmesee.. SMP=1 by default.. Mmmm... looks very bad.
On a constructive note, could there be an SMP cache-sync problem with DMA (IDE or SCSI) ?
SMP really should be OFF by default, especially as SMP kernels do not survive booting on many non-SMP machines. ...
> And yes, in the Free/NetBSD camp it _is_ acceptable to say "don't use too > long a cable".
That's from the IDE (ATA) specs. 18" max.
The timings with DMA are *identical* to the timings with PIO, so if it fails with DMA, it will fail with PIO as well.
Removing DMA from the kernel solves nothing there. -- mlord@pobox.com The Linux IDE guy
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