[Lustre-discuss] Early replies from pre-1.6.5 servers?
Brian Behlendorf
behlendorf1 at llnl.gov
Wed Jul 30 15:36:25 PDT 2008
Daniel,
> Daniel Kobras wrote:
> > Hi!
> >
> > While debugging connection problems on a Lustre client running 1.6.5.1
> > on RHEL5, I discovered early replies in the client debug output.
> > Adaptive timeouts are disabled on the client, and our server
> > infrastructure in running stock 1.6.4.3 (RHEL5), still. As far as I
> > understood, early replies should only occur post 1.6.5 when adaptive
> > timeouts are active. Did I get this wrong, and early replies are
> > prefectly valid even in our setup? Or is the 1.6.5.1 client
> > misinterpreting message headers?
>
> You're right, in your setup we shouldn't expect any early reply at all.
> The 1.6.4 server perhaps immediately send a reply in which a reserved
> field was not initialize to 0, which was interpreted by 1.6.5 client as
> an early reply, then be discarded because of size doesn't match.
>
> I guess it's not easy to reproduce, right? You can file a bug on our
> bugzilla, with as much information as possible. Thanks a lot.
I ran in to the same problem while testing 1.6.5. I saw bug 16237 was already
open on the issue so I attached a proposed fix. Details can be found in the
bug.
https://bugzilla.lustre.org/show_bug.cgi?id=16237
--
Thanks,
Brian
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