Date: Sun, 27 Jul 2003 22:21:53 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: ticso@cicely.de Subject: Re: NFS hangs appears dc(4) newbusification related Message-ID: <20030727202152.GN42805@cicely12.cicely.de> In-Reply-To: <20030727200816.GB608@athlon.pn.xcllnt.net> References: <20030726081120.GA7470@dhcp01.pn.xcllnt.net> <20030726163016.GF95189@freebie.xs4all.nl> <20030726183007.GA575@dhcp01.pn.xcllnt.net> <20030726184509.GA4440@freebie.xs4all.nl> <20030726192133.GB575@dhcp01.pn.xcllnt.net> <20030727081715.GB6392@freebie.xs4all.nl> <20030727091517.GA468@freebie.xs4all.nl> <20030727194616.GA608@athlon.pn.xcllnt.net> <20030727200356.GL42805@cicely12.cicely.de> <20030727200816.GB608@athlon.pn.xcllnt.net>
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On Sun, Jul 27, 2003 at 01:08:16PM -0700, Marcel Moolenaar wrote: > On Sun, Jul 27, 2003 at 10:03:57PM +0200, Bernd Walter wrote: > > > > It is true since day one and therefor TCP NFS never worked reliable > > on alpha. > > If and how often you trigger the bug depends on your usage. > > If you see anything else then an alignment panic then it's something > > new. > > It must be something new then. Which only means that a broken state > has further regressed... > > > > o Using TCP based NFS mounts is indeed broken and should at least > > > be mentioned somewhere, because the breakage is only visible on > > > alpha. Ideally it should be fixed. > > > > The alignemt bug is a problem on other strong alignment platforms as > > well. > > I don't see it here on ia64 nor sparc64. It happens rarely under very high load. There is a realignment code that works fine for a single missalignment in the input mbuf cluster, but fails if there is a second one. That also means that we need a condition with multiple transactions in the input queue to trigger this bug. Maybe it only triggers in server code, but the problem exists in the client code as well. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de
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