nfs-server twice as fast written to as read from

[Willem Jan Withagen]

> Is testing a nfs-server with current as of July 9'th.
> While copying to and from the server to two different
> hosts, I noticed that copying _to_ the server was
> twice as fast as copying _from_ the server. This was
> regardless of which host I tested from.
>
> Is using tcp, r/w-size 65536 on client, server:
>
> net.inet.tcp.sendspace: 65536
> net.inet.tcp.recvspace: 65536
>
> All hosts are on 100 Mbit/s.
>
> It takes 5 min. 30 sec. copying 3 GB to, 11 min. 43
> sec. from the nfs-server. Is there a penalty reading
> from the server in relation to nfs?

I've done some nfs "benchmarking", but not (yet) with two clients and one
server. (Mainly) because I'm still looking for a comparable third system.

Results of that are on:
    http://withagen.dyndns.org/FreeBSD/notes/NFS-performance

It's nothing really scientific, but it shows some trends...
And yours is certainly not one I have seen.

--WjW