From mboxrd@z Thu Jan 1 00:00:00 1970 From: Willy Tarreau Subject: GRO + splice panics in 3.7.0-rc5 Date: Thu, 15 Nov 2012 23:28:12 +0100 Message-ID: <20121115222812.GA647@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: eric.dumazet@gmail.com To: netdev@vger.kernel.org Return-path: Received: from 1wt.eu ([62.212.114.60]:35780 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750851Ab2KOW2S (ORCPT ); Thu, 15 Nov 2012 17:28:18 -0500 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Hello, I was just about to make a quick comparison between LRO and GRO in 3.7.0-rc5 to see if LRO still had the big advantage I've always observed, but I failed the test because as soon as I enable LRO + splice, the kernel panics and reboots. I could not yet manage to catch the panic output, I could just reliably reproduce it, it crashes instantly. All I can say at the moment is the following : - test consist in forwarding HTTP traffic between two NICs via haproxy - driver used was myri10ge - LRO + recv+send : OK - LRO + splice : OK - GRO + recv+send : OK - GRO + splice : panic - no such problem was observed in 3.6.6 so I think this is a recent regression. I'll go back digging for more information, but as I'm used to often see Eric suggest the right candidates for reverting, I wanted to report the issue here in case there are easy ones to try first. Thanks, Willy