gigabit, 2.4.22 and timeo

[Roberto Sebastiano <robs@multiplayer.it>]

Hi,
I have this hw setup:
1 Dual PIII 1Ghz, Intel PRO/1000MT nic, linux 2.4.22 (nfs client)
1 Single P4 2.53Ghz, Intel PRO/1000MT nic, linux 2.4.22, fast RAID5 scsi
disk subsystem (nfs server)
These are cross-connected and both have jumbo frames enabled
This setup will (hopefully) be used to share files between two web
servers under load balancing

Now, to the problem.
I specified the mount options as follows (from /proc/mounts):
rw,v3,rsize=8192,wsize=8192,hard,intr,udp,lock,addr=192.168.2.1

When I copy a large file over the network, on the client side I see: 
Oct 14 13:39:24 flanders kernel: nfs: server 192.168.2.1 not responding,
still trying
Oct 14 13:39:24 flanders last message repeated 5 times
Oct 14 13:39:24 flanders kernel: nfs: server 192.168.2.1 OK
Oct 14 13:39:24 flanders last message repeated 5 times
Oct 14 13:39:25 flanders kernel: nfs: server 192.168.2.1 not responding,
still trying
Oct 14 13:39:26 flanders last message repeated 11 times
Oct 14 13:39:26 flanders kernel: nfs: server 192.168.2.1 OK

But the cp process goes just fine.
Setting retrans to 5 or higher "solves" the problem (copying is still ok
and no errors are triggered), but setting timeo to a larger value (60 or
so) doesn't seem to have any effect (between the start of the copy and
the printf of the message, there are only two seconds or so)

I think that the client is just assuming a too low timeout value, and it
keeps sending requests
I found that with nfs over TCP this problem doesn't occur


Is there any way to solve this ?

Thanks,
-- 
Roberto Sebastiano <robs@multiplayer.it>



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