Date: Thu, 10 Jan 2002 16:33:13 -0800 (PST) From: Doug White <dwhite@resnet.uoregon.edu> To: Dmitry Morozovsky <marck@rinet.ru> Cc: Josh Paetzel <friar_josh@webwarrior.net>, <freebsd-stable@FreeBSD.ORG> Subject: Re: Reproducable system hangs in -STABLE Message-ID: <20020110163043.S95050-100000@resnet.uoregon.edu> In-Reply-To: <20020110211312.C15653-100000@woozle.rinet.ru>
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On Thu, 10 Jan 2002, Dmitry Morozovsky wrote: > Hmm... Is it related to SMP machines only or to uni-processor machines > too? I have no SMP machines with dnetc's around to test, but every UP > machine with dnetc starts it reniced -20, and there were no lockups at > all... I've mainly seen it on SMP. > Also, would you please give me a link to thread/article duscussing > "classic priority inversion proble"? The classic priority inversion problem is when you have two processes with differing priorities. The lower-priority process will lock a resource that a higher-priority process needs. Since the higher-priority process will block the lower-priority process from running, the lock is never released. Thus the deadlock. If you run dnetc at something other than nice 20 it should avoid the deadlock. Doug White | FreeBSD: The Power to Serve dwhite@resnet.uoregon.edu | www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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