How to increase rsize/wsize on ubuntu server 9.10

[Rui Yan]

Hi,

I failed to mount a nfs share with a bigger rsize/wsize (in my case, 512K) on my Ubuntu 9.10 server box.   The biggest rsize/wsize I can get is only 256KB . 

The client and server (in my case, d03 and d04) are directly connected
to a gigabit switch. The MTU is default 1500.  Server and client are
with the same hardware.  Ubuntu 9.10 server version is installed with
default configurations.

root at d03:~# exportfs -v
/tmp              <world>(rw,wdelay,root_
squash,no_subtree_check)

root at d04:~# mount -t nfs -o wsize=524288,rsize=524288 d03:/tmp /mnt/nfs

root at d04:~# nfsstat -m
/mnt/nfs from d03:/tmp
Flags:    rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.0.0.3,mountvers=3,mountproto=tcp,addr=10.0.0.3

root at d03:~# uname -a
Linux d03 2.6.31-14-server #48-Ubuntu SMP Fri Oct 16 15:07:34 UTC 2009
x86_64 GNU/Linux

root at d03:~# dpkg -l | grep nfs
ii  nfs-common                        1:1.2.0-2ubuntu8
NFS support files common to client and serve
ii  nfs-kernel-server                 1:1.2.0-2ubuntu8
support for NFS kernel server

According to NFS-HOWTO, I have checked the kernel const
NFSSVC_MAXBLKSIZE.  It is 1M on 2.6.31.

Any comments will be appreciated!

Regards,
Rui
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