On 15 July 2014 18:01, Pieper, Jeffrey E <jeffrey.e.pie...@intel.com> wrote: > I believe the Linux driver DOES however support UDP RSS port hash. It is used > for environments where you can ensure there is no fragmentation. In such use > cases, this allows for a significant performance benefit. >
Right. For my RSS hacking, I've added a new in_rss.c function that returns the currently supported hashes, so it'll be possible for an administrator to define whether to support UDP hashing on 4-tuple or 2-tuple. I plan on adding a software hash calculation function to optionally calculate the 2-tuple or 4-tuple RSS hash as appropriately required so it can be run after IP reassembly if it's required. So, if the admin wants a 4-tuple UDP hash and it receives fragmented UDP, then it will re-assemble, calculate 4-tuple and kick it up. If they want 2-tuple, then it'll only calculate a software hash if it wasn't given one by the driver. Argh, so many weird corner cases to handle and I haven't even started hacking on the memcached/varnish stuff :( Thanks! -a _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
