Re: [E1000-devel] ipip tunnels on 82599EB with ixgbe driver

[Tantilov, E. S <emi...@in...>]

Sorry for the late reply.

Could you provide the exact version of the driver you are using?

Is it the built-in driver in the kernel or an out-of-tree from SF?

Thanks,
Emil

>-----Original Message-----
>From: Sorin Dumitru [mailto:dum...@gm...]
>Sent: Thursday, March 22, 2012 12:44 AM
>To: e10...@li...
>Subject: [E1000-devel] ipip tunnels on 82599EB with ixgbe driver
>
>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