From mboxrd@z Thu Jan 1 00:00:00 1970 From: Charles Vejnar Subject: Re: ixgbe unstable performance at 1Gb/s Date: Wed, 26 Sep 2012 20:33:04 +0200 Message-ID: <50634A60.40609@unige.ch> References: <87618083B2453E4A8714035B62D6799216E25153@FMSMSX102.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE To: "Tantilov, Emil S" , "netdev@vger.kernel.org" Return-path: Received: from mc2.unige.ch ([129.194.9.215]:43758 "EHLO unige.ch" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757471Ab2IZSng (ORCPT ); Wed, 26 Sep 2012 14:43:36 -0400 Received: from mmp3.unige.ch ([129.194.7.203]) by unige.ch stage1 with esmtp (Exim MailCleaner) id 1TGwPw-0006nP-Iw for from ; Wed, 26 Sep 2012 20:33:04 +0200 Received: from [129.194.101.63] (sancy.unige.ch [129.194.101.63]) by mmp3.unige.ch (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPSA id <0MAY00D5FZJ40X40@mmp3.unige.ch> for netdev@vger.kernel.org; Wed, 26 Sep 2012 20:33:04 +0200 (MEST) In-reply-to: <87618083B2453E4A8714035B62D6799216E25153@FMSMSX102.amr.corp.intel.com> Sender: netdev-owner@vger.kernel.org List-ID: Le 25/09/2012 19:58, Tantilov, Emil S a =E9crit : >> -----Original Message----- >> From: netdev-owner@vger.kernel.org [mailto:netdev-owner@vger.kernel.= org] On >> Behalf Of Charles >> Sent: Monday, September 24, 2012 10:47 AM >> To: netdev@vger.kernel.org >> Subject: ixgbe unstable performance at 1Gb/s >> >> Hi, >> >> I hope I am posting on the right mailing-list. If not, sorry; please >> redirect me >> to the right place. Thanks. >> >> I have a new motherboard with integrated Intel X540 10GBase-T. For n= ow, I >> want >> to use it at 1Gb/s. >> >> The bandwidth is only of ~300 Mbit/s (with Iperf). It's actually ver= y >> unstable >> (always varies between 100 to 800 Mbit/s during the transfer). > Do you by any chance have CONFIG_IXGBE_PTP set in your kernel config? > > If so, try disabling it and see if it fixes your performance. > > Thanks, > Emil > Hi, Thanks for your reply. I compiled manually the ixgbe module with the default options of my=20 distribution (Archlinux). I had the same problem. I then changed the CONFIG_IXGBE_PTP to no (default is yes) as you=20 suggested, and recompiled. The problem disappeared; normal transfer. Could you please explain why this PTP is causing a problem? How can thi= s=20 be fixed without having to recompile the module (ethtool, /sys, bios...= =20 )? Thanks Regards, Charles