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Re: NFS performances

On Mon, May 12, 2014 at 03:03:22PM +0000, Emmanuel Dreyfus wrote:
> Hello
> I have a NFS setup with both NetBSD 6 client and server over a
> gigabit network. Theperformance seems week, even whle client,
> server and network are almost idle.
> The test: time dd if=/dev/zero of=test bs=1024k count=100
> Done on the NFS server itself:
>    5.31s real 0.00s user 0.39s system
> Done over NFS:
>    9.82s real 0.00s user 0.12s system
> The overhead looks huge. This is a UDP mount with a 1500 bytes MTU,
> ping is at 0.8 ms from a virtualized client, ang 0.28 ms for a physical one.
> Are the numbers reasonable? Should I consider a 59% NFS overhead  as
> acceptable, or are there some parameters to tweak?

I find the server quite slow on the local test. Does it have enough CPU
to process NFS traffic at this speed ? Have you enabled checksum offloads
on the interfaces ?

Have you tried TCP and UDP mounts, and playing with the -r and -w options ?

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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