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" <m...@sentex.net> > To: "Adam Stylinski" <kungfujesu...@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, m...@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-unsubscr...@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 postmas...@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
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