Hi Eric,
I did have the SCSI Queue Debugging option turned ON in the kernel and the
error message I sent in my original posting was all that appeared.
Cheers,
Nigel
Eric Youngdale wrote:
>
> And I just remembered a good way to track this down. Turn on the
> kernel
> option for debugging the new queueing code. After each merge, it should
> verify that the number of segments isn't too large, and it will panic when
> this happens. You should get a line number and source file - this will
> tell
> us which function is screwing up. If that isn't enough, we can fix it to
> display more debugging information until we know exactly what is wrong with
> the merging.
>
> -Eric
>
> ----- Original Message -----
> From: Jens Axboe <[EMAIL PROTECTED]>
> To: Eric Youngdale <[EMAIL PROTECTED]>
> Cc: Nigel Chan <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Tuesday, April 04, 2000 2:06 PM
> Subject: Re: Bad segment list supplied to aha1542.c
>
> > On Tue, Apr 04 2000, Eric Youngdale wrote:
> > > > It could get in there if the write / read is big enough, nothing is
> > > > limiting the number of request segments for such hardware right now
> > > > (aside from the ll_rw_blk default MAX_SEGMENTS).
> > >
> > > No, the code in scsi_merge.c should be checking the limit. In
> > > aha1542.h, the symbol is AHA1542_SCATTER, and this is stored in the
> host
> > > template in the field sg_tablesize. In scsi_merge.c there are places
> all
> > > over where we check against this limit before we allow another segment
> to be
> > > added, and someplace this isn't working correctly.
> >
> > Of course you are right, I hadn't looked closely enough at the merging
> > in scsi_merge.c. Initially I can't see why an extra segment could
> > get added.
> >
> > --
> > * Jens Axboe <[EMAIL PROTECTED]>
> > * Linux CD/DVD-ROM, SuSE Labs
> > * http://kernel.dk
> >
> > -
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> >
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