Date: Thu, 8 Feb 1996 07:04:23 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: imp@village.org (Warner Losh) Cc: daveh@ntanet.net, freebsd-hackers@FreeBSD.ORG Subject: Re: Is there a FreeBSD automounter? Message-ID: <199602081204.HAA29813@hda.com> In-Reply-To: <199602080422.VAA11483@rover.village.org> from "Warner Losh" at Feb 7, 96 09:22:40 pm
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>
> : well, maybe its just me, but
> : actually having several cdroms mounted at once
> : on this machine causes instability.
>
> I've had no problems here, but maybe there is something wrong with the
> drivers/kernel that you are using. I'm using 2.0R, and it seems stable
> enough... Maybe 2.1R or -current has some flakiness in it that I
> wouldn't be seeing...
>
> Warner
I think 2.0R and 2.1R has the bug - are you using all 7 drives?
Bruce submitted a patch to fix the problem and it is committed to
the recent kernels in -stable and -current. If you have this in
cd.c:
> if(cd->dkunit > 0) {
you have the bug. I tested it out with this:
if(cd->dkunit >= 0) {
dk_xfer[cd->dkunit]++;
dk_seek[cd->dkunit]++; /* don't know */
dk_wds[cd->dkunit] += bp->b_bcount >> 6;
}
#if defined(SCSI_CDBUG_NOISE)
else if (cd->dkunit) {
printf("cd: Would have clobberred the kernel.\n");
}
#endif
Set SCSI_CDBUG_NOISE and you'll see how often you are trashing things.
--
Peter Dufault Real-Time Machine Control and Simulation
HD Associates, Inc. Voice: 508 433 6936
dufault@hda.com Fax: 508 433 5267
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