From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Battersby Subject: Re: BUG: sky2: hw csum failure with dual-port copper NIC on SMP Date: Wed, 14 Nov 2007 10:37:10 -0500 Message-ID: <473B1626.20507@cybernetics.com> References: <4739E425.20408@cybernetics.com> <20071113141414.0959735a@freepuppy.rosehill> <473A2BC8.7000909@cybernetics.com> <20071113152755.4d55c86a@freepuppy.rosehill> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from host06.cybernetics.com ([206.246.200.22]:2668 "EHLO mail.cybernetics.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755704AbXKNPhI (ORCPT ); Wed, 14 Nov 2007 10:37:08 -0500 In-Reply-To: <20071113152755.4d55c86a@freepuppy.rosehill> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org >> Do you want the test program I am using? It is a pretty basic >> send()/recv() program, ~650 lines of C. >> >> Tony >> >> > > Not really, iperf drives the problem fine. > > Thanks for the tip; I hadn't tried iperf before today. I can reproduce the problem with "iperf -s" on the system with the dual-port SysKonnect NIC and "iperf -c host -t 120" on the two Intel PRO/1000 (e1000 driver) client systems. The problem doesn't seem to happen the other way around though (running the server on the two Intel PRO/1000 systems and two iperf clients on the SysKonnect system). So the problem appears to be triggered by recv() on the SysKonnect side but not send(). Tony