Asymmetric NFS Performance

[Tim Daneliuk]

Server:            FBSD 8.2-STABLE / MTU set to 15000
Client:            Linux Mint 12   / MTU set to 8192
NFS Mount Options: rw,soft,intr
Problem:

Throughput copying from Server to Client is about 2x that when
copying a file from client to server.  The client does have
a SSD whereas the server has conventional SATA drives but ...
This problem is evident with either 100- or 1000- speed ethernet
so I don't think it is a drive thing since you'd expect to saturate
100-BASE with either type of drive.

Things I've Tried So Far:

- Increasing the MTUs - This helped speed things up, but the up/down
   ratio stayed about the same.

- Fiddling with rsize and wsize on the client - No real difference


Ideas anyone?







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Tim Daneliuk