Date: Thu, 28 Apr 2011 09:29:22 -0400 From: Adam Stylinski <kungfujesus06@gmail.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-net@freebsd.org Subject: Re: em0 performance subpar Message-ID: <20110428132922.GC2800@ossumpossum.geop.uc.edu> In-Reply-To: <4DB965D8.7090906@sentex.net> References: <20110428072946.GA11391@zephyr.adamsnet> <4DB965D8.7090906@sentex.net>
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[-- Attachment #1 --] On Thu, Apr 28, 2011 at 09:04:24AM -0400, Mike Tancsa wrote: > 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/ lspci -lvc: em0@pci0:7:5:0: class=0x020000 card=0x13768086 chip=0x107c8086 rev=0x05 hdr=0x00 vendor = 'Intel Corporation' device = 'Gigabit Ethernet Controller (Copper) rev 5 (82541PI)' class = network subclass = ethernet cap 01[dc] = powerspec 2 supports D0 D3 current D0 cap 07[e4] = PCI-X supports 2048 burst read, 1 split transaction vmstat -i: interrupt total rate irq1: atkbd0 6 0 irq14: ata0 30306 1 irq18: ohci0 ohci1* 5 0 irq20: em0 994488 43 irq24: aac0 107044 4 irq40: hptrr0 89761 3 irq48: fwohci0+ 5047 0 cpu0: timer 45466809 1999 irq256: ahci1 83842 3 cpu2: timer 45458298 1999 cpu3: timer 45458296 1999 cpu1: timer 45458295 1999 Total 183152197 8055 -- 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) iQIcBAEBAgAGBQJNuWuyAAoJED6sRHE6TvmnnlAQANSHsX5yLRf5d3pcFTKRnNxw u039V0m3bdkIk0/3TuBJDpqW5J9jf9VwaRAoDPNJOvnkkDGmxUKhigadWQ2YVphO UgzrFo0kdXuEKEYK2bn89ITJrQKJmqUUWlhqsCRZ0+LRjspO1EKJKtfyJK362QGl yMtDxKn+P7sgFPOy2qFnI5dBNDM16E6fxhZWFWNr6IEOkezwhxizwhqD20cvh9CW 9Wom9iauRQbqIlS9ttTkYkIWbRZ+Sxl0xn7dXTUEzVJrk19EuU2ILWSXJHw+Eb6p HdRnIdvllWa/fVvkEt+4gw6BKWy2HvWAGH19fcHqFEeT8hn97qCDXpV4h7McrJ0W cjmqrx8lSU3vBhe2I54vzgq1u0tYyAAIiH7dDoF/siOtZlFa2gGeHv+9X6iu2zTQ zVzv33rWa6CRo0qsOFXWmrx5tsqNZ/y0K7a/6U/lARSpjqc1GeKuz+3TTLTuH6mG 0nNjIAQU9tW3FsqQ6x8Ocq+zBva0S/oUE+kSuL53KJXu7klHzMYpKZLiQdQoccAf dV/vRSHK+1Jcq5cLRd1DexNBcFJ8oBVwhM4HxQF2klzZD6Ww4u/WQxVEymHALS2q pkZ4+2UKdRsXLQD98WDL1j06B335PolXSgkBGDMTaTOO/5zggDUfO04ETmI9nkLy CIFyUkZKUoAOAdW5gXt/ =G+64 -----END PGP SIGNATURE-----
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