From mboxrd@z Thu Jan 1 00:00:00 1970 From: Charles Vejnar Subject: Re: ixgbe unstable performance at 1Gb/s Date: Thu, 27 Sep 2012 10:32:59 +0200 Message-ID: <50640F3B.6030102@unige.ch> References: <87618083B2453E4A8714035B62D6799216E25153@FMSMSX102.amr.corp.intel.com> <50634A60.40609@unige.ch> <87618083B2453E4A8714035B62D6799216E25F9C@FMSMSX102.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: "netdev@vger.kernel.org" , "Kirsher, Jeffrey T" To: "Tantilov, Emil S" Return-path: Received: from mc1.unige.ch ([129.194.9.214]:59105 "EHLO unige.ch" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751316Ab2I0IdC (ORCPT ); Thu, 27 Sep 2012 04:33:02 -0400 Received: from mmp3.unige.ch ([129.194.7.203]) by unige.ch stage1 with esmtp (Exim MailCleaner) id 1TH9Wl-0004i7-HA for from ; Thu, 27 Sep 2012 10:32:59 +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 <0MB000DTM2EZ0XE0@mmp3.unige.ch> for netdev@vger.kernel.org; Thu, 27 Sep 2012 10:32:59 +0200 (MEST) In-reply-to: <87618083B2453E4A8714035B62D6799216E25F9C@FMSMSX102.amr.corp.intel.com> Sender: netdev-owner@vger.kernel.org List-ID: Le 26/09/2012 22:22, Tantilov, Emil S a =E9crit : >> -----Original Message----- >> From: Charles Vejnar [mailto:Charles.Vejnar@unige.ch] >> Sent: Wednesday, September 26, 2012 11:33 AM >> To: Tantilov, Emil S; netdev@vger.kernel.org >> Subject: Re: ixgbe unstable performance at 1Gb/s >> >> Le 25/09/2012 19:58, Tantilov, Emil S a =E9crit : >>>> -----Original Message----- >>>> From: netdev-owner@vger.kernel.org [mailto:netdev-owner@vger.kerne= l.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; plea= se >>>> redirect me >>>> to the right place. Thanks. >>>> >>>> I have a new motherboard with integrated Intel X540 10GBase-T. For= now, >> I >>>> want >>>> to use it at 1Gb/s. >>>> >>>> The bandwidth is only of ~300 Mbit/s (with Iperf). It's actually v= ery >>>> 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 confi= g? >>> >>> 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 >> distribution (Archlinux). I had the same problem. >> >> I then changed the CONFIG_IXGBE_PTP to no (default is yes) as you >> suggested, and recompiled. The problem disappeared; normal transfer. >> >> Could you please explain why this PTP is causing a problem? How can = this >> be fixed without having to recompile the module (ethtool, /sys, bios= =2E.. >> )? Thanks > This is actually a bug in the driver. We should have a patch out very= soon to address it. > >> Regards, >> >> Charles > Thanks, > Emil Hi Emil, > This is actually a bug in the driver. We should have a patch out ver= y=20 soon to address it. OK. Please send a reply to this thread when it's available. I can test=20 the patch. Thanks Charles