Subject: Re: Soft Errors / DMA errors on IBM 18G ATAPI disk
To: Manuel Bouyer <email@example.com>
From: jiho <firstname.lastname@example.org>
Date: 10/19/1999 12:34:10
> I think the 'disconnect' feature has to be explicitely asked by the driver
> (I don't have the draft under hands) for each command, so I don't think
> this is the problem.
Hmm, no, it doesn't sound very plausible, if it's per-command.
If it was "global", I'd be more suspicious that some drives might think they
don't need to be asked, in violation of the (draft? You mean it isn't even a)
> I'm pretty sure now that there is a problem with interrupts in the IDE driver
> (or maybe a more general problem which only affects the IDE driver).
> It seems that sometimes the IDE driver gets an IRQ even when we're still at
> splbio() ...
Now that's _really_ interesting.
If it's a general problem, I'm not so sure it only affects the IDE driver.
I was already wondering if there isn't something screwy going on with the PS/2
mouse driver and its interrupts. It seems especially prone to trouble while
I'm downloading data via my dial-up ISP, through my internal modem's serial
port -- in other words, when the serial port driver and the PS/2 mouse driver
are both getting interrupts. The net result seems to be bogus mouse events,
which can cause various problems for clients who don't/can't filter them out
properly. I don't know if/how it affects/involves the serial port driver.
I was able to reduce the frequency of this by tinkering with the PS/2 mouse
driver, but still get the occasional blow-up.
> Still investigating ...
I'd like to say I'm "still investigating" but I've hardly started, because I'm
not really sure _where_ to start....
--Jim Howard <email@example.com>