Re: [Xen-devel] domU NFS performance

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 Aug 2005, at 11:23, Nicholas Lee wrote:

> One of the things I've noted when using mutt is particular problems
> with 'c' opening a new folder.  I'm using courier-imap/maildir, and my
> mail spool has almost a 1000 folders.
We certainly have seen inter-domain network problems in the past, but 
usually they crop up when running services in dom0, and moving them to 
domU fixes things. So this is odd because the behaviour appears to be 
reversed.
A few things to try: Use TCP rather than UDP as the transport protocol. 
Also, try setting rsize/wsize to less than the MTU (e.g. 1024). If the 
latter fixes things, try setting just one of rsize/wsize to the lower 
value.
UDP and IP fragmentation have been the biggest sources of problems for 
us. And I'm not totally sure how well Linux NFS implementation recovers 
from packet loss when it runs over UDP.
 -- Keir


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