From owner-freebsd-current@FreeBSD.ORG Thu Oct 30 04:46:57 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5CA5516A4CE for ; Thu, 30 Oct 2003 04:46:57 -0800 (PST) Received: from prg.traveller.cz (prg.traveller.cz [193.85.2.77]) by mx1.FreeBSD.org (Postfix) with ESMTP id 18DAE43FB1 for ; Thu, 30 Oct 2003 04:46:56 -0800 (PST) (envelope-from mime@traveller.cz) Received: from prg.traveller.cz (localhost [127.0.0.1]) by prg.traveller.cz (8.12.10/8.12.10/prg) with ESMTP id h9UCksjZ044589 for ; Thu, 30 Oct 2003 13:46:54 +0100 (CET) Received: from localhost (mime@localhost)h9UCksgx044586 for ; Thu, 30 Oct 2003 13:46:54 +0100 (CET) Date: Thu, 30 Oct 2003 13:46:54 +0100 (CET) From: Michal Mertl To: current@freebsd.org Message-ID: <20031029183808.M99053@prg.traveller.cz> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Subject: jumbograms (& em) & nfs a no go X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Oct 2003 12:46:57 -0000 I wanted to test gigabit network performance and found out that current (from 5.0 to up to date -current) doesn't fully work with jumbograms (MTU set to 6000), Intel adapters and nfs (both UDP and TCP). I checked that the same thing works with 4.9. I then left one computer at 4.9 and upgraded the other to 5.0. When I mount a partition from 5.0 machine I found out, that copying reliably works only from 5.0 to 4.9. The other way around I see messages 'em0: discard oversize frame (ether type 800 flags 3 len 67582 > max 6014)' on 5.0 and the copying stalls. On 4.9 machine I later see 'nfs server 10.0.0.2:/usr: not responding'. The interface is stuck for some time - can be revived by changing mtu back to 1500 and down/up sequence. -- Michal Mertl