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, m...@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
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