How to increase rsize/wsize ?

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Hi,

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

root@d03:~# exportfs -v
/tmp              <world>(rw,wdelay,root_squash,no_subtree_check)

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

root@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@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@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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