Date: Thu, 02 Sep 2010 11:36:57 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Garrett Wollman <wollman@bimajority.org> Cc: current@FreeBSD.org Subject: Re: Difficulty playing DVDs under AHCI/CAM? Message-ID: <4C7F6229.3040708@icyb.net.ua> In-Reply-To: <19582.39357.917382.37670@hergotha.csail.mit.edu> References: <19577.18337.120013.129482@hergotha.csail.mit.edu> <4C79499B.3050305@icyb.net.ua> <201008281741.o7SHfqH1008851@hergotha.csail.mit.edu> <AANLkTint5bqYoA7gscywbnpg-AH3Fzu=vUR=DUOA8LtV@mail.gmail.com> <alpine.BSF.2.00.1009011032460.5375@thor.farley.org> <4C7E7C43.7070209@icyb.net.ua> <19582.39357.917382.37670@hergotha.csail.mit.edu>
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on 01/09/2010 21:21 Garrett Wollman said the following: > <<On Wed, 01 Sep 2010 19:16:03 +0300, Andriy Gapon <avg@icyb.net.ua> said: > >> Just want to draw attention of those who use ahci, have hald running and burn >> optical media to couple of known issues: > > What about those of us who use ahci, don't have hald running, and just > want to read their DVDs? I am not aware of any known but not resolved issues in this context. But I think that I gave you a good advice. > I never heard any response from you when I > asked for a more specific debugging procedure. Sorry about that, forgot to tell you about google. Now, apologies about the joke, no offense meant :-) These links should give a good overview for the start: http://wiki.freebsd.org/DTrace http://wiki.freebsd.org/DTrace/Examples http://www.freebsd.org/doc/handbook/dtrace.html http://wikis.sun.com/display/DTrace/Documentation And, oh, here is a script that I used to investigate a somewhat similar problem with failing ioctl. I think you should be able to easily adapt it to your needs. syscall::ioctl:entry /execname == "k3b" && arg1 == 3299349762/ { self->trace = 1; } fbt:::entry /self->trace/ { } fbt:::return /self->trace/ { printf("%d", arg1); } syscall::ioctl:return { self->trace = 0; } > My next step was going > to be enabling CAMDEBUG and trying to find out which specific > operation was failing, but I'm not a SCSI expert by any means.... Not sure if debugging with CAMDEBUG would be easier or not. There could be lots of output. -- Andriy Gapon
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