On Tue, Aug 26, 2014 at 12:17:28PM +0000, Emmanuel Dreyfus wrote: > Hi > > ixgb(4) has poor performances, even on latest -current. Here is the > dmesg output: > ixg1 at pci5 dev 0 function 1: Intel(R) PRO/10GbE PCI-Express Network Driver, > Version - 2.3.10 > ixg1: clearing prefetchable bit > ixg1: interrupting at ioapic0 pin 9 > ixg1: PCI Express Bus: Speed 2.5Gb/s Width x8 > > The interface is configued with: > ifconfig ixg1 mtu 9000 tso4 ip4csum tcp4csum-tx udp4csum-tx
MTU 9000 considered harmful. Use something that fits in 8K with the headers. It's a minor piece of the puzzle but nonetheless, it's a piece. Thor