Re: NFS client problems in 2.4.18 to 2.4.20

[Jamie Lokier]

Joshua Weage wrote:
> There aren't any clues in the kernel logs, except that the kernel does
> report "nfs server not responding" and never comes back with "nfs
> server OK".  I've enabled kernel debugging on all of the cluster nodes,
> but the above message is all that I get in the logs.
> 
> I'll have to try out tcpdump the next time this happens.

Look for lots of retransmits from the client.  This might be the bug
where it adjusts the retransmit timeout to a ridiculously small
sub-millisecond value, because of a sequence of fast cached responses
from the server, then when the server responds slowly due to a disk
access the client times out within milliseconds.  Repeatedly.

-- Jamie
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