Date: Thu, 26 May 2005 14:51:55 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Sten Spans <sten@blinkenlights.nl> Cc: current@freebsd.org, Mohan Srinivasan <mohan_srinivasan@yahoo.com>, stable@freebsd.org, ticso@cicely.de, Oliver Lehmann <lehmann@ans-netz.de> Subject: Re: problems with nfs+TCP - Resource temporarily unavailable Message-ID: <20050526125154.GC80082@cicely12.cicely.de> In-Reply-To: <Pine.SOC.4.61.0505261429530.18365@tea.blinkenlights.nl> References: <20050525223355.56551.qmail@web80601.mail.yahoo.com> <20050526010325.02415410.lehmann@ans-netz.de> <20050526085750.GZ80082@cicely12.cicely.de> <Pine.SOC.4.61.0505261243440.18365@tea.blinkenlights.nl> <20050526105806.GB80082@cicely12.cicely.de> <Pine.SOC.4.61.0505261429530.18365@tea.blinkenlights.nl>
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On Thu, May 26, 2005 at 02:37:35PM +0200, Sten Spans wrote: > On Thu, 26 May 2005, Bernd Walter wrote: > > >>> > >>>This is absolutely known - TCP/nfs has bugs in realigning packets. > >>>Don't use TCP on strong aligned architectures. > >> > >>Still a pr with a proper backtrace would be nice. > >>Or does one exist already ? > > > >Not that I know. > >I did know exactly when this happens years ago. > >The backtrace as such will not help you as the panic happens much > >later than the cause. > >IIRC the basic problem was that the realignment code only fixes > >a single missalignment, while theres a chance for more then one. > >Verify nfs_realign in nfsserver and nfsclient to get an idea. > >If you are interested - I've found a (non-working) patch that I wrote > >for it, but the intention of it should be clear. > > > > Sure. This is an nfsd specific problem, > Or does nfsclient have issues as well ? The code is the same in client and server - as well as the risk to get packets in that form from network. > I'll get a pr going to make sure that the issue > is documented, and possibly narrowed down enough for > other people to start painting a bikeshed about how > it should be fixed. OK. -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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