From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: 2.4.20+NFS_ALL mount hanging, procs stuck in D state
Date: Tue, 25 Feb 2003 18:13:49 +0100
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To: Andrew Ryan <andrewr@nam-shub.com>
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>>>>> " " == Andrew Ryan <andrewr@nam-shub.com> writes:

     > According to subsequent messages in this thread, bad network
     > data can sometimes hang TCP mounts, but I got the same effect
     > on UDP. Which shouldn't happen, right? That would imply that
     > something isn't right in the linux NFS client.

That depends. The UDP client emulates the TCP congestion control (with
exponential backoff etc), so of course it can end up hanging. If
indeed your problem was a bad switch, then lost packets can quickly
end up slowing throughput to a trickle (which would appear to the user
as if the NFS client is hanging)

Cheers,
  Trond


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