Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270474AbTG1SvM (ORCPT ); Mon, 28 Jul 2003 14:51:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270486AbTG1SvM (ORCPT ); Mon, 28 Jul 2003 14:51:12 -0400 Received: from mail.jlokier.co.uk ([81.29.64.88]:64898 "EHLO mail.jlokier.co.uk") by vger.kernel.org with ESMTP id S270474AbTG1SvI (ORCPT ); Mon, 28 Jul 2003 14:51:08 -0400 Date: Mon, 28 Jul 2003 20:05:43 +0100 From: Jamie Lokier To: James Stevenson Cc: Doruk Fisek , linux-kernel@vger.kernel.org Subject: Re: hw tcp v4 csum failed Message-ID: <20030728190543.GA10426@mail.jlokier.co.uk> References: <20030727100246.4bfb860c.dfisek@fisek.com.tr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 946 Lines: 22 James Stevenson wrote: > > I am getting "hw tcp v4 csum failed" errors using a BCM5701 ethernet > > adapter with the tigon3 driver in a vanilla 2.4.20 kernel. > Its probably a problem releated to the cable or surrounding > interference on the cable. This is an ethernet adapter. It means that interference problems should cause CRC32 errors, and the packets will be dropped/logged at the MAC layer, and the TCP checksum not checked. The MAC layer CRC32 is strong enough that TCP checksum errors should be exceedingly rare, unless the interference is very bad and a very large number of packes are being submitted. Perhaps the error message is not really indicating TCP checksum errors? -- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/