Date: Thu, 28 Apr 2011 10:13:39 -0400 From: Adam Stylinski <kungfujesus06@gmail.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-net@freebsd.org Subject: Re: em0 performance subpar Message-ID: <20110428141339.GD2800@ossumpossum.geop.uc.edu> In-Reply-To: <B04EE072E7F04402AC289EFBF55E1D05@multiplay.co.uk> References: <20110428072946.GA11391@zephyr.adamsnet> <4DB965D8.7090906@sentex.net> <B04EE072E7F04402AC289EFBF55E1D05@multiplay.co.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --] On Thu, Apr 28, 2011 at 02:52:59PM +0100, Steven Hartland wrote: > 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" <mike@sentex.net> > To: "Adam Stylinski" <kungfujesus06@gmail.com> > Cc: <freebsd-net@freebsd.org> > 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. > I am running FreeBSD 8.2-RELEASE on one of the boxes with the issues, and the other box which has the same issue is 8-STABLE. The issue doesn't seem isolated to one box though and like I said, Linux seems to not have this issue. -- Adam Stylinski PGP Key: http://pohl.ececs.uc.edu/~adam/publickey.pub Blog: http://technicallyliving.blogspot.com [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (FreeBSD) iQIcBAEBAgAGBQJNuXYSAAoJED6sRHE6TvmnVyYP/1hIzq7S7JMvNPPqbt2eN+yN cN9e4qKnrjRpui5fbufI4WPlTGzKCtN69vhgkXq1k5oKTF9We48UN+eWiLmi4QP+ tGbyHmA6GQMLhohq8iPOiPLJnigIyk5kXxlIMlA5Wf6toKwmQHugtUv1FLHX3ml2 pYO+eZ7xkqHTjy2QwtBkq4TqiSAxi6WG5HMPA5pBEHe0TOgPyGDq4mNK0FXpama4 lOSLpnV/wCSXIscCfJ+HrcVIsCfgWpsC0sjroowm8jSmjuXQweOn0hHvut8puD54 9zeRlLiy6WLhP3BQo2ByJ9FBMJpoDjoh08Bm4/2uXUgcg5aFByNR6YTjuEtl+bfU 8FLKMg0LIEmexgYfWRSJ9RZ8eHmVCmI3bh+5bGaxcYfGRFYd/DLWaeNaosdQs5Sa e7CmaQaHhylIG/NsagQJo+pcbxtLF+4sY7atEiijidS0Yb1DnZlFpgU/G/l/PFKm 6J4S8wPq0COmZgOWJHcIJvHOXxKYTY5jwDL5fhlmwjHQgKGh6ZLF+HSAR9UmRr/X YZGbTpONcc9oZ2A/LSQi3zPNNCCZpMIbEyH/CpWfBgYIyujdJpf/nQ/0PhZmZa9l 1T2FduEjtBNdlz+bQULmxnKtf57sf+ocK76iqJ3tXfSZiLTaKkEOWCfmc9sbRFsO JbyLK9BMcHZ0rYWZELtn =/b2b -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20110428141339.GD2800>