From owner-freebsd-questions  Sun Jul 15 21:45:29 2001
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Date: Sun, 15 Jul 2001 21:45:38 -0700
From: Arun Sharma <arun@sharmas.dhs.org>
To: Dan Nelson <dnelson@emsphone.com>
Cc: questions@FreeBSD.ORG
Subject: Re: NFS mount Linux Mandrake 8.0 -> FreeBSD 4.3-STABLE hang
Message-ID: <20010715214538.A20260@sharmas.dhs.org>
References: <20010715200102.A19948@sharmas.dhs.org> <20010715220415.A3289@dan.emsphone.com>
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In-Reply-To: <20010715220415.A3289@dan.emsphone.com>; from dnelson@emsphone.com on Sun, Jul 15, 2001 at 10:04:15PM -0500
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On Sun, Jul 15, 2001 at 10:04:15PM -0500, Dan Nelson wrote:
> In the last episode (Jul 15), Arun Sharma said:
> > I use amd to NFS mount /net/<linux-box>/foo 
> > 
> > and then try:
> > 
> > $ cp /net/*/foo/bar to /tmp
> > 
> > For small files, it works ok. For anything larger than a few kilobytes,
> > cp hangs. So does any command that does any directory operations on
> > /tmp.
> 
> Try tcpdumping both machines.  NFS prefers to use 8K data packets, so
> if you've got a broken router inbetween the two boxes, the packets may
> get dropped instead of fragmented.  Going to TCP NFS mounts will fix
> it, if that is the problem.

Actually, I figured out that the cp doesn't hang, but takes a *long*
time - longer than it takes to transfer the file via scp over the
same interface.

tcpdump shows that NFS is using 8kb block size, but packets get
fragmented because I'm on a wireless network with a MTU < 2k.

	-Arun

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