Date: Fri, 20 Oct 2006 17:08:15 +0200 From: rvenne@dental-on-line.fr Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: NFS: freeze during copy [ RESOLVED] Message-ID: <4538E65F.2090208@dental-on-line.fr> In-Reply-To: <4522184A.6050107@dental-on-line.fr> 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> <4522184A.6050107@dental-on-line.fr>
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rvenne@dental-on-line.fr wrote: > 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. > luc, remember, use keep frags in your ipf, that could save your life. -- Richard VENNE www.dental-on-line.com Phone: 01 43 27 94 24 fax: 01 43 27 66 85
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