nfs client speed lower than expected.

Gary Gatten Ggatten at
Thu Nov 3 00:06:01 UTC 2011

Is the interface really at 1Gb?  Have you tested with iperf, ftp, or anything other than nfs?

-----Original Message-----
From: owner-freebsd-questions at [mailto:owner-freebsd-questions at] On Behalf Of Vincent Hoffman
Sent: Wednesday, November 02, 2011 6:52 PM
To: FreeBSD-Questions at
Subject: nfs client speed lower than expected.

Hi all,
        What kind of speed should I be expecting over an NFS mount from
a linux box using a gig interface (igb)? I'm seeing linux clients
getting approx 2 or 3 times the throughput rsyncing files from a linux
nfs server that i get from a 8-stable FreeBSD client.
representative results
7.26MB/s - Freebsd client
21.10MB/s liunx client
I've tried a variety of files to try and take caching out of the
equation, I've tweaked a few sysctls after much googling


with no obvious improvement.
freebsd mount options
linux mount options

I have seen that using the linux server as an nfs client to write to the
NFS server on the freebsd box gives similar performance to a linux
client pulling from the linux server so I'm guessing its something to do
with the freebsd nfs client?

Any suggestions/clues welcome.

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