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Date:      Fri, 24 Apr 2009 20:18:13 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-questions@freebsd.org
Subject:   Re: NFS slow
Message-ID:  <gssvpm$lkd$1@ger.gmane.org>
In-Reply-To: <26653.1927897178$1240593938@news.gmane.org>
References:  <26653.1927897178$1240593938@news.gmane.org>

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Jan Catrysse wrote:
> Hello all,
>=20
> I am having some problems with NFS and slow performance.
> This is the scenario:
>=20
> 2x FreeBSD 7.1. (Raid storage server, MP, the works)
>=20
> GB Lan interface between them.
>=20
> When I transfer 1 big file the speed is never higher than 10MB/s with a=
 peak
> to 14MB/s.
>=20
> When I transfer multiple files at the same time speed is about 10MB/s p=
er
> thread.
> Disk speed > 100MB/s
>=20
> Network speed using samba > 60MB/s (limited by clients disk speed)
>=20
> Tried enabling NFSlockd, NFSstatd but that changes nothing.
>=20
> Any help or hunch would be greatly appreciated.

Here are some ideas for testing:

* Any firewall in between them? Do you have network errors?
* Any other network problems, like DNS lookup failures? (not that it
should matter for sustained tranfers but still...)
* Are you using TCP or UDP for NFS? TCP should be better in all cases.
* Have you monitored the system with "top"? Try hitting "S" and "H" in
top while transfering files, see if anything looks suspicious.
* Run "iostat 1", check tps and KB/t.
* What file system are you using?


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