From owner-freebsd-net@FreeBSD.ORG Wed May 30 10:44:31 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 2E5A4106566C for ; Wed, 30 May 2012 10:44:31 +0000 (UTC) (envelope-from bruce@cran.org.uk) Received: from muon.cran.org.uk (muon.cran.org.uk [IPv6:2a01:348:0:15:5d59:5c40:0:1]) by mx1.freebsd.org (Postfix) with ESMTP id B28E58FC08 for ; Wed, 30 May 2012 10:44:30 +0000 (UTC) Received: from muon.cran.org.uk (localhost [127.0.0.1]) by muon.cran.org.uk (Postfix) with ESMTP id F2B61E6546 for ; Wed, 30 May 2012 11:45:02 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cran.org.uk; h=message-id :date:from:mime-version:to:subject:content-type :content-transfer-encoding; s=mail; bh=GJV5E3f+aVWFtpxwNMKmaRbZN eU=; b=jcfxNdZ8hRKNK2RfgbfL8ZXnKPlS1LV93xvDo0jFX+fpsKdS7rsd279wt ccOszql5x/1e3s80vz4LW+Sycd+FzJHbuEmyfeEm+iUDcuIYA/nL1kXb3xGoRpbo kQqgjgFQHQogE6kZh8+3Bpqs4dVMMh9UJmaLVKG6GIp1+lub58= DomainKey-Signature: a=rsa-sha1; c=nofws; d=cran.org.uk; h=message-id :date:from:mime-version:to:subject:content-type :content-transfer-encoding; q=dns; s=mail; b=olWiaOgcPHYznw6Rx1I 5VOpWMVKhn03SK8pvzDShRhPwxaVWAls+Gqd/dhPp0nDqZNe1ZjtJwb/K/zt3lcW iQgntsuamEdtCAEYvWxJDW+RtV37ikUfglaSd5yRa9ktfJB0Hdg/oj0XBQ6/xKVd qeI9uRWuf45ILAPvTLEOEjUY= Received: from [192.168.2.115] (unknown [93.89.81.205]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by muon.cran.org.uk (Postfix) with ESMTPSA id AF66AE652F for ; Wed, 30 May 2012 11:45:02 +0100 (BST) Message-ID: <4FC5FA0B.5010609@cran.org.uk> Date: Wed, 30 May 2012 11:44:27 +0100 From: Bruce Cran User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: freebsd-net@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: if_em and large mtu bug? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 May 2012 10:44:31 -0000 Are there any known problems with if_em and jumbo packets? I've found that my ssh connection breaks (when running dmesg etc.) if I configure the mtu to 9216 via rc.conf - but if I initially use a 1500 byte mtu and then manually configure it to 9216 then no problems occur. I'm running the latest -current: the hardware is: em0: port 0xdc00-0xdc1f mem 0xfbde0000-0xfbdfffff,0xfbd00000-0xfbd7ffff,0xfbddc000-0xfbddffff irq 16 at device 0.0 on pci1 em0: Using MSIX interrupts with 3 vectors -- Bruce Cran