Date: Tue, 03 Oct 2006 09:59:06 +0200 From: rvenne@dental-on-line.fr Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: NFS: freeze during copy [ ALMOST RESOLVED] Message-ID: <4522184A.6050107@dental-on-line.fr> In-Reply-To: <1159551223.1006.42.camel@dagobah.vindaloo.com> References: <B6D948D84090A54ABCD88AA391DAAC8C049CF550@tiasbel00ex00.be.eu.tiauto.com> <451939DA.3060709@dental-on-line.fr> <D930A855-AEAC-4EC3-AEE5-313858E2DAB2@khera.org> <451A2E87.6000301@dental-on-line.fr> <451A4045.7020000@dental-on-line.fr> <20060927165109.GA52006@xor.obsecurity.org> <7457F6C0-4E6A-47C4-9981-89627B20B94A@khera.org> <20060927203710.GA54541@xor.obsecurity.org> <1159551223.1006.42.camel@dagobah.vindaloo.com>
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Christopher Sean Hilton wrote: >On Wed, 2006-09-27 at 16:37 -0400, Kris Kennaway wrote: > > >>>and my luck has it such that i've not had a lockup since i added that >>>extra debugging code into the kernel :-) or :-( depending on your >>>view... >>> >>> >>Heisenbugs are great! :) >> >> >> > >Before I classified this as a Heisenbug I'd switch from NFS over UDP to >NFS over TCP. The original poster also hasn't mentioned if he's using >soft, or hard mounts or if he has the intr option on. Depending on how >these options are tuned NFS lockups are normal. > >I used keep /usr/src mounted via NFS and do make buildworld/installworld >on my laptop. The network was a switched lan and there were no >firewalls. Very occasionally the build process would lockup. When I went >to debug this a sage wizard suggested that the first step was to switch >from UDP to TCP. As it turns out the problem was that the ne2000 driver >on my laptop was loosing packets. With udp the means to detect this was >weak to non-existant. Changing to TCP meant that not only could the >kernel detect that a packet had gotten lost but it only had to resend >that one packet, not the entire buffer. From that point on the build >process worked flawlessly in fact I was able to extend the process to >work between a local NFS server and a remote NFS client located 25 miles >away at the other end of an IPsec tunnel. > >Bottom line: change to TCP and retest. NFS over UDP is very sensitive to >packet loss. > >-- Chris > > > yeah, your'ar right, NFS tcp would be propably better. My setup was using UDP with changing port, that's the reason why, as for me, the copy was freezed after somes bytes. But I still supprised by kernel freezing after a night, so that I've had to reboot the server. As 5.x's support will be stopped, I'd better to upgrade all to 6.1 ( NFS problems, openssl secure issues...) thanks a lot for all. -- Richard VENNE www.dental-on-line.com Phone: 01 43 27 94 24 fax: 01 43 27 66 85
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