slow response

I have a NFS server with debian stable and kernel 2.6.10. The package nfs-kernel-server setup the server.
The clients, with same software, mount it with:

IP_ADD:/home/vmail /home/vmail nfs rw,hard,intr 0 0

in fstab.

I use NFS to store mailboxes in a qmail-ldap cluster.
My problem is that suddenly the clients received extremely slow responses from the server.
In the client a simple "ls" in the mounted partition took minutes to execute.

While this happens, ping and other protocols run well between server and client, only NFS had problems.

I made a simple test, with no traffic I can access the share without problems, very fast, but as soon as I redirect traffic to this client(which is a qmail server), it turns very very slow.

Any idea why and how to fix it?

Omar

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