Date: Sat, 19 Mar 2005 08:07:35 -0700 From: Scott Long <scottl@samsco.org> To: Danny Braniss <danny@cs.huji.ac.il> Cc: scsi@freebsd.org Subject: Re: iSCSI initiator driver beta version, testers wanted Message-ID: <423C4037.3090801@samsco.org> In-Reply-To: <E1DCcbo-000ABI-Fu@cs1.cs.huji.ac.il> References: <E1DCcbo-000ABI-Fu@cs1.cs.huji.ac.il>
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Danny Braniss wrote: >>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 > > > No, you need to grab Giant when calling xpt_done(). I even put an assertion into CAM to make sure of that. Are you running with WITNESS and/or INVARIANTS enabled? Those would have caught this problem. Scott
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