Hi, We are trying to run a large number of ip in ip(ipv6 over ipv4 or ipv4 ove ipv6) tunnels over intel cards with the ixgbe driver. This is what lspci is showing about these cards: 04:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit Network Connection (rev 01) 04:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit Network Connection (rev 01)
I think that the hardware isn't able to parse the packets after the first IP header so the only hashing it uses to distribute packets to receive queues is done based on the first IP header. Because that header is the same for all packets, all packets will arrive on the same cpu, which doesn't scale very well for us. I've attached what /proc/interrupts is showing, as you can see all packets arrive on CPU6. Is there some way we can convince the hardware to distribute these packets on all cpus? If we could at least include the second ip header, we would get a much better distribution because there are many users on these tunnels. I know we can do this from software on linux, but we are using linux 2.6.32, which doesn't have this option and upgrade isn't really an option right now. We are also using a rather old driver(i think it's a version from early 2010), have any improvements been made in newer versions on this issue? Thanks, Sorin
ixgbe_interrupts
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