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Old 31st October 2013
mickywicky mickywicky is offline
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Default OpenBSD NFS server over TCP performance

Hi guys,

I finally nailed this problem which had been bugging me for a few months, so here's my notes in case anyone else gets this.

PROBLEM: OpenBSD NFS server, using TCP, is slow - less than 20% the throughput of SMB or SFTP. Observed on OS X, FreeBSD and Linux clients.
Switching to UDP solves the throughput issue.

What bugged me was one client was connecting over a powerline network link with reliability issues. So UDP was not really an option there

After much trial and error I found this: setting rsize, wsize and dsize to 65536 on the client, TCP throughput matched UDP, give or take 5%.
The defaults in /usr/src/sys/nfs/nfs.h (on 5.3-STABLE) are set at 8192 - for NFSv2 compatibility?

Hope this helps someone.
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Old 30th December 2013
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hanzer hanzer is offline
Real Name: Adam Jensen
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I tried this from a Xubuntu box lucidrine connecting to an OpenBSD NFS server insomnia:

hanzer@lucidrine:~$ sudo mount.nfs -o rsize=65536,wsize=65536 insomnia:/video /home/hanzer/Videos

Data transfer increased from ~7MB/sec to ~25MB/sec.

Much appreciated!
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nfs, nfs over tcp, nfs over udp, nfs performance

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