From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: Re: LRO disable warnings on kernel 2.6.38 Date: Mon, 21 Mar 2011 11:04:12 +0100 Message-ID: <1300701852.10934.67.camel@firesoul.comx.local> References: <1300446743.11985.317.camel@firesoul.comx.local> <4D8385CE.1060205@intel.com> <1300699294.10934.63.camel@firesoul.comx.local> <1300700708.2884.10.camel@edumazet-laptop> <1300701232.2884.12.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Alexander Duyck , netdev , Neil Horman , Stanislaw Gruszka To: Eric Dumazet Return-path: Received: from lanfw001a.cxnet.dk ([87.72.215.196]:49803 "EHLO lanfw001a.cxnet.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751444Ab1CUKEO (ORCPT ); Mon, 21 Mar 2011 06:04:14 -0400 In-Reply-To: <1300701232.2884.12.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2011-03-21 at 10:53 +0100, Eric Dumazet wrote: > Couly you please send us the result of "ethtool -k eth01" to make sure > its the problem ? prod server: albpd4:~# ethtool -k eth01 Offload parameters for eth01: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: on ntuple-filters: off receive-hashing: off pre-prod server: albpd1:~# ethtool -k eth01 Offload parameters for eth01: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off ntuple-filters: off receive-hashing: off Hmm... notice how the large-receive-offload (LRO) is different on the two machines. I cannot disable LRO with userspace ethtool: albpd4:~# ethtool -K eth01 lro off Cannot set large receive offload settings: Invalid argument -- Med venlig hilsen / Best regards Jesper Brouer ComX Networks A/S Linux Network Kernel Developer Cand. Scient Datalog / MSc.CS Author of http://adsl-optimizer.dk LinkedIn: http://www.linkedin.com/in/brouer