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Date: Sat, 19 Mar 2005 13:59:12 +0200
From: Danny Braniss <danny@cs.huji.ac.il>
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cc: Sam Leffler <sam@errno.com>
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Subject: Re: iSCSI initiator driver beta version, testers wanted 
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> with tags enabled, iSCSI is much faster, but it also causes a deadlock :-(
> this is what i run:
> 	newfs -U /<iscsi device>
> 	cd /<iscsi device>
> 	restore rf /home/file.dump
> 
> on the same motherboard, a dual Xeon, with smp disabled all is OK
> with smp enabled restore gets stuck usualy waiting on biord.
> the iscsi driver shows that all requests have been done, the sniffing
> shows the same(ie all request have been done).
> 
> so this leads me to think that there is some race condition that i'm not
> aware of in a SMP system, where xpt_done(ccb) is called while
> another process is calling biowait.
> 
> another lead is that after restore gets stuck, the system slowly gets 
> 'stalled'.
> 
> any insight is most welcome!, i'm also stuck.

ahh, hate talking to myself :-)

grabbing Giant before calling xpt_done solved it, so the problem is
most probably in the CAM ...

danny