linux-kernel - Re: high latency NFS

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Message-ID: <75b66ecd0807301707x9fbcfe6na91abd70c2d7d652@mail.gmail.com>
Date:	Wed, 30 Jul 2008 20:07:10 -0400
From:	"Lee Revell" <rlrevell@...-job.com>
To:	shuey@...due.edu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: high latency NFS

On Thu, Jul 24, 2008 at 1:11 PM, Michael Shuey <shuey@...due.edu> wrote:
> NFS mount is tcp, version 3.  rsize/wsize are 32k.  Both client and server
> have had tcp_rmem, tcp_wmem, wmem_max, rmem_max, wmem_default, and
> rmem_default tuned - tuning values are 12500000 for defaults (and minimum
> window sizes), 25000000 for the maximums.  Inefficient, yes, but I'm not
> concerned with memory efficiency at the moment.

Try using UDP.  I had to move a 10TB+ data warehouse over a 100Mbit
WAN link not long ago and this was the only method that gave me close
to wire speed.

Lee
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