From owner-freebsd-questions@FreeBSD.ORG Tue May 31 15:45:12 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9B2DF16A41C; Tue, 31 May 2005 15:45:12 +0000 (GMT) (envelope-from skylar@cs.earlham.edu) Received: from cs.earlham.edu (cs.earlham.edu [159.28.230.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id C281A43D55; Tue, 31 May 2005 15:45:10 +0000 (GMT) (envelope-from skylar@cs.earlham.edu) Received: from [159.28.57.98] (wir057098.rpa.earlham.edu [159.28.57.98]) (authenticated bits=0) by cs.earlham.edu (8.13.4/8.13.3) with ESMTP id j4VFj3OR076121 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 31 May 2005 10:45:05 -0500 (EST) (envelope-from skylar@cs.earlham.edu) Message-ID: <429C867A.5040909@cs.earlham.edu> Date: Tue, 31 May 2005 10:44:58 -0500 From: Skylar Thompson Organization: Earlham College Computer Science Department User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Jon Dama References: <200505270711.j4R7BTMf078204@gw.catspoiler.org> In-Reply-To: X-Enigmail-Version: 0.89.5.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig3DAFB34E835079E79DE17BB3" X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (cs.earlham.edu [159.28.230.3]); Tue, 31 May 2005 10:45:05 -0500 (EST) X-Virus-Scanned: ClamAV 0.85.1/900/Tue May 31 05:50:19 2005 on quark.cs.earlham.edu X-Virus-Status: Clean X-Sanitizer: This message has passed the MIMEDefang sanitizer. X-Sanitizer-URL: http://www.cs.earlham.edu/applied-groups/admin/ X-Sanitizer-Version: MIMEDefang/ECSanitizer $Revision: 1.18 $ X-Sanitizer-Config-Version: $Revision: 1.180 $ X-Scanned-By: MIMEDefang 2.51 on 159.28.230.3 X-Spam-Status: No, score=-2.8 required=8.0 tests=ALL_TRUSTED autolearn=failed version=3.0.3 X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on quark.cs.earlham.edu Cc: Don Lewis , freebsd-stable@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Weird NFS problems X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 May 2005 15:45:12 -0000 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--