Date: Tue, 31 May 2005 10:44:58 -0500 From: Skylar Thompson <skylar@cs.earlham.edu> To: Jon Dama <jd@ugcs.caltech.edu> Cc: Don Lewis <truckman@freebsd.org>, freebsd-stable@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Weird NFS problems Message-ID: <429C867A.5040909@cs.earlham.edu> In-Reply-To: <Pine.LNX.4.53.0505270145160.640@ngwee.ugcs.caltech.edu> References: <200505270711.j4R7BTMf078204@gw.catspoiler.org> <Pine.LNX.4.53.0505270145160.640@ngwee.ugcs.caltech.edu>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig3DAFB34E835079E79DE17BB3 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Jon Dama wrote: >Try switching to TCP NFS. > >a 100MBit interface cannot keep up with a 1GBit interface in a bridge >configuration. Therefore, in the long run, at full-bore you'd expect to >drop 9 out of every 10 ethernet frames. > >MTU is 1500 therefore 1K works (it fits in one frame), 2K doesn't (your >NFS transactions are split across frames, one of which will almost >certainly be dropped, it's UDP so the loss of one frame invalidates the >whole transaction). > >This is the same reason you can't use UDP with a block size greater than >MTU to use NFS over your DSL or some such arrangement. > >Incidentially, this has nothing to do with FreeBSD. So if using TCP >mounts solves your problem, don't expect Solaris NFS to magically make the >UDP case work... > > The thing is that UDP NFS has been working for us for years. A big part of our work is performance analysis, so to change our network architecture will invalidate a large part of our data. -- -- Skylar Thompson (skylar@cs.earlham.edu) -- http://www.cs.earlham.edu/~skylar/ --------------enig3DAFB34E835079E79DE17BB3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCnIZ8sc4yyULgN4YRAt74AJ9z2oHXVKIsnUj8g7IIDtQBjhV1QwCeOrFK TRhd7d4MbXi8b2qxX2b5+Bo= =wMiU -----END PGP SIGNATURE----- --------------enig3DAFB34E835079E79DE17BB3--
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