From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755985Ab3AFMBj (ORCPT ); Sun, 6 Jan 2013 07:01:39 -0500 Received: from 1wt.eu ([62.212.114.60]:37533 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752129Ab3AFMBi (ORCPT ); Sun, 6 Jan 2013 07:01:38 -0500 Date: Sun, 6 Jan 2013 13:01:29 +0100 From: Willy Tarreau To: Eric Dumazet Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Gallatin Subject: Re: Major network performance regression in 3.7 Message-ID: <20130106120129.GA22432@1wt.eu> References: <20130106005053.GS16031@1wt.eu> <1357435276.1678.5067.camel@edumazet-glaptop> <20130106013027.GV16031@1wt.eu> <1357436430.1678.5111.camel@edumazet-glaptop> <1357437086.1678.5135.camel@edumazet-glaptop> <1357438591.1678.5205.camel@edumazet-glaptop> <20130106025256.GY16031@1wt.eu> <1357457724.1678.5941.camel@edumazet-glaptop> <20130106092435.GZ16031@1wt.eu> <20130106102525.GA22151@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130106102525.GA22151@1wt.eu> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jan 06, 2013 at 11:25:25AM +0100, Willy Tarreau wrote: > OK good news here, the performance drop on the myri was caused by a > problem between the keyboard and the chair. After the reboot series, > I forgot to reload the firmware so the driver used the less efficient > firmware from the NIC (it performs just as if LRO is disabled). > > That makes me think that I should try 3.8-rc2 since LRO was removed > there :-/ Just for the record, I tested 3.8-rc2, and the myri works as fast with GRO there as it used to work with LRO in previous kernels. The softirq work has increased from 26 to 48% but there is no performance drop when using GRO anymore. Andrew has done a good job ! Willy