Hello Kelvin, I somehow missed your reply. On Tue, 2010-02-16 at 15:02 -0500, Kelvin Ku wrote: > > Did it help? > > I switched to an 82576 NIC. The kernel igb driver (version 1.3.16-k2) has > multiqueue enabled by default with 4 rx and 4 tx queues. I'm running with 4096 > rx ring entries enabled. > > The target app is performing well on the igb NIC whereas on the e1000e NIC it > was missing packets. I say "missing" rather than "dropped" because these > packets don't show up on any error counters. However, in throughput testing, we > can't receive faster than 905-910 Mbps whereas we can reliably receive at 950 > Mbps on our older non-Nehalem machines. You should see the missing package using $ ethtool -s. (Most likely rx_missed_errors) > > I usually disable power management. > > Be advised, that we are using 10GbE cards and not 1GbE, so we are more > > vulnerable to > > scaling-the-core-down-right-when-the-cards-starts-flooding-the-hell-out-of-it... > > I notice that ASPM is enabled on the 82576 NIC and the PCIe ports. Have you > disabled ASPM? Disabling C-STATE had no effect on throughput or app > performance. At 1Gbps, it shouldn't. We have ASPM enabled on quad-1GbE and 10GbE without an issue. > > I'm going to test with ASPM disabled later today. > > > > > P.S. Please post your complete hardware configuration. (Board, CPU, > > in-which slot did you put the NIC, etc) > > > I've attached dmidecode and lspci output. Here's a summary: > > Motherboard: Supermicro X8DTL-iF > CPU: Single Xeon E5530 > RAM: 3x1GB 1333MHz DDR3 ECC Registered > > The 82576 NIC is inserted into a PCIe 2.0 x8 slot. The weird things is that a two PCI-E 1.0 channels should be more-than to drive a dual port 1GbE card - let alone 8x/2.0... I'm stumped. Side question: Why did you buy an expensive dual socket board, and dual socket capable CPU (Xeon 55xx) to run a single CPU? If you don't need the extra codes (or memory), a normal desktop X58/Core i5/i7 will be just as good and far less expensive. - Gilboa -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
