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Re: [Xen-devel] domU NFS performance

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] domU NFS performance
From: Nicholas Lee <emptysands@xxxxxxxxx>
Date: Mon, 29 Aug 2005 23:58:10 +1200
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 8/29/05, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> 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.

Just quickly remounting in TCP mode for both the mail and shell server
didn't seem to help the mutt issue. I can reliably get this issue to
reoccur by simply 'R' entering the Drafts folder. Then 'e' exiting
back to the INBOX.  I'll see if I can put together a test account for
this at the end of the week.

I'll look at trying NFS with TCP or smaller UDP on the desktop domU tomorrow.

Nicholas Lee
gpg 8072 4F86 EDCD 4FC1 18EF  5BDD 07B0 9597 6D58 D70C

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