From owner-freebsd-net@FreeBSD.ORG Thu Apr 28 14:04:16 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 32FBE106564A for ; Thu, 28 Apr 2011 14:04:16 +0000 (UTC) (envelope-from prvs=10995192f0=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id AFC358FC0A for ; Thu, 28 Apr 2011 14:04:15 +0000 (UTC) X-MDAV-Processed: mail1.multiplay.co.uk, Thu, 28 Apr 2011 14:52:51 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Thu, 28 Apr 2011 14:52:51 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 ([188.220.16.49]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50013096532.msg for ; Thu, 28 Apr 2011 14:52:49 +0100 X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=10995192f0=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-net@freebsd.org Message-ID: From: "Steven Hartland" To: "Mike Tancsa" , "Adam Stylinski" References: <20110428072946.GA11391@zephyr.adamsnet> <4DB965D8.7090906@sentex.net> Date: Thu, 28 Apr 2011 14:52:59 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6090 Cc: freebsd-net@freebsd.org Subject: Re: em0 performance subpar X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2011 14:04:16 -0000 Running em's here we regularly see them hitting pretty much line rate although there are a lot of different em's Here we have the following under 8.0+ em0@pci0:6:0:0: class=0x020000 card=0x000015d9 chip=0x10968086 rev=0x01 hdr=0x00 vendor = 'Intel Corporation' device = 'Intel PRO/1000 EB (Intel PRO/1000 EB)' class = network subclass = ethernet You don't say which OS version your running? Regards Steve ----- Original Message ----- From: "Mike Tancsa" To: "Adam Stylinski" Cc: Sent: Thursday, April 28, 2011 2:04 PM Subject: Re: em0 performance subpar > On 4/28/2011 3:29 AM, Adam Stylinski wrote: >> Hello, >> >> I have an intel gigabit network adapter (the 1000 GT w/chipset 82541PI) which performs poorly in Freebsd compared to the same >> card in Linux. I've tried this card in two different freebsd boxes and for whatever reason I get poor transmit performance. >> I've done all of the tweaking specified in just about every guide out there (the usual TCP window scaling, larger nmbclusters, >> delayed acks, etc) and still I get only around 600mbps. I'm using jumbo frames, with an MTU of 9000. I'm testing this with >> iperf. While I realize that this may not be the most realistic test, linux hosts with the same card can achieve 995Mbit/s to >> another host running this. When the Freebsd box is the server, Linux hosts can transmit to it at around 800 something Mbit/s. >> I've increased the transmit descriptors as specified in the if_em man page, and while that gave me 20 or 30 more mbit/s, my >> transmit performance is still below normal. >> >> sysctl stats report that the card is trigger a lot of tx_desc_fail2: >> dev.em.0.tx_desc_fail2: 3431 > > Try the tests using the tools in /usr/src/tools/tools/netperf to > generate / test udp traffic. > > Perhaps give the driver from HEAD a try. There are a few fixes to it. I > back ported it to RELENG_8, but it should work on 8.2R as well. > > http://www.tancsa.com/em-723.tgz > > what does pciconf -lvc for your em NIC show ? > also, vmstat -i > > ---Mike > > > > -- > ------------------- > Mike Tancsa, tel +1 519 651 3400 > Sentex Communications, mike@sentex.net > Providing Internet services since 1994 www.sentex.net > Cambridge, Ontario Canada http://www.tancsa.com/ > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.