From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: Bad UDP checksum with 82540EM Date: Sun, 8 Feb 2004 07:46:43 +0100 Sender: netdev-bounce@oss.sgi.com Message-ID: <20040208074643.482ab4c7.ak@suse.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: jonmason@us.ibm.com, cramerj@intel.com, netdev@oss.sgi.com, netdev-bounce@oss.sgi.com Return-path: To: Andreas Schwab In-Reply-To: Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Sat, 07 Feb 2004 23:42:21 +0100 Andreas Schwab wrote: > Jon D Mason writes: > > > This probably isn't helpful, but it sounds like a hardware error. Is the > > error occurring on multiple/all HP adapters, or only one? > > I've also seen it with a HP branded BCM5701 on IA64, but also with a > Broadcom BCM5702 on AMD64 (both using the tg3 driver). It seems like > broken UDP checksumming is rather common. :-( It could be still a software bug. When hardware checksumming is available the UDP packets use a slightly different path through the stack. Could you perhaps test if the problem occurs in a 32bit box with the same NIC ? Maybe it is some 64bit problem somewhere in software. -Andi