From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruce Allen Subject: (unknown) Date: Wed, 16 Apr 2008 04:38:44 -0500 (CDT) Message-ID: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Bruce Allen , Carsten Aulbert , Henning Fehrmann To: netdev@vger.kernel.org Return-path: Received: from trinity.phys.uwm.edu ([129.89.57.159]:59981 "EHLO trinity.phys.uwm.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756606AbYDPKOU (ORCPT ); Wed, 16 Apr 2008 06:14:20 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Dear Netdev, We're doing some HPC Linpack testing on cluster nodes with the e1000 driver. Sometimes the networking appears to 'hang'. The switches have their egress buffers full, but it seems as if the compute nodes are not accepting any more traffic. (Yes, pause RX is off.) We notice that rx_no_buffer_count and rx_missed_errors sometimes have high counts. Could somebody explain to us what this means? Any suggestions for improving matters? Cheers, Bruce