From owner-freebsd-net@FreeBSD.ORG Wed May 30 22:26:09 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 321F1106567C for ; Wed, 30 May 2012 22:26:09 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from mx1.sbone.de (mx1.sbone.de [IPv6:2a01:4f8:130:3ffc::401:25]) by mx1.freebsd.org (Postfix) with ESMTP id D84CC8FC08 for ; Wed, 30 May 2012 22:26:08 +0000 (UTC) Received: from mail.sbone.de (mail.sbone.de [IPv6:fde9:577b:c1a9:31::2013:587]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mx1.sbone.de (Postfix) with ESMTPS id A437725D385D; Wed, 30 May 2012 22:26:07 +0000 (UTC) Received: from content-filter.sbone.de (content-filter.sbone.de [IPv6:fde9:577b:c1a9:31::2013:2742]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPS id BB88ABE8144; Wed, 30 May 2012 22:26:06 +0000 (UTC) X-Virus-Scanned: amavisd-new at sbone.de Received: from mail.sbone.de ([IPv6:fde9:577b:c1a9:31::2013:587]) by content-filter.sbone.de (content-filter.sbone.de [fde9:577b:c1a9:31::2013:2742]) (amavisd-new, port 10024) with ESMTP id dkb5VMNaPyjJ; Wed, 30 May 2012 22:26:05 +0000 (UTC) Received: from orange-en1.sbone.de (orange-en1.sbone.de [IPv6:fde9:577b:c1a9:31:cabc:c8ff:fecf:e8e3]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPSA id 81C29BE8145; Wed, 30 May 2012 22:26:05 +0000 (UTC) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=utf-8 From: "Bjoern A. Zeeb" In-Reply-To: <4FC6062A.3010002@rdtc.ru> Date: Wed, 30 May 2012 22:26:04 +0000 Content-Transfer-Encoding: quoted-printable Message-Id: References: <4FC5FA0B.5010609@cran.org.uk> <4FC6062A.3010002@rdtc.ru> To: Eugene Grosbein X-Mailer: Apple Mail (2.1084) Cc: Bruce Cran , freebsd-net@freebsd.org Subject: Re: 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 22:26:09 -0000 On 30. May 2012, at 11:36 , Eugene Grosbein wrote: > 30.05.2012 17:44, Bruce Cran =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >> Are there any known problems with if_em and jumbo packets? I've found=20= >> that my ssh connection breaks (when running dmesg etc.) if I = configure=20 >> the mtu to 9216 via rc.conf - but if I initially use a 1500 byte mtu = and=20 >> then manually configure it to 9216 then no problems occur. >>=20 That is due to another known bug; if you check netstat -rn and the mtu there on your routes you'll figure. if you remove your addresses/routes and re-add them after changing the = mtu, you'll see it as well. >> I'm running the latest -current: the hardware is: >>=20 >> em0: port 0xdc00-0xdc1f = mem=20 >> 0xfbde0000-0xfbdfffff,0xfbd00000-0xfbd7ffff,0xfbddc000-0xfbddffff irq = 16=20 >> at device 0.0 on pci1 >> em0: Using MSIX interrupts with 3 vectors >=20 > I confirm this with FreeBSD 8.2-STABLE/amd64, > em(4) 7.3.2, Intel PRO/1000 EB. >=20 > There is a workaround, though: ifconfig em0 -rxcsum -txcsum mtu 9000 > work from the beginning. >=20 > Eugene Grosbein >=20 > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" --=20 Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!