On 07/11/16 18:20, David Miller wrote: > From: Edward Cree <ec...@solarflare.com> > Date: Thu, 3 Nov 2016 22:10:31 +0000 > >> EF10 based NICs have configurable RSS hash fields, and can be made to take >> the >> ports into the hash on UDP (they already do so for TCP). This patch series >> enables this, in order to improve spreading of UDP traffic. > What does the chip do with fragmented traffic? Only the first fragment will be considered UDP, it will treat the rest as "other IP" and 2-tuple hash them, probably hitting a different queue.
My understanding is that while that will reduce performance, that shouldn't be a problem as performance-sensitive users will avoid fragmentation anyway. It could also lead to out-of-order packet delivery, but it's UDP so that's supposed to be OK.
