NFS: freeze during copy [ RESOLVED]

[rvenne at dental-on-line.fr]

rvenne at 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
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