On Tue, 2017-06-06 at 16:23 +0200, Paolo Abeni wrote: > when udp_recvmsg() is executed, on x86_64 and other archs, most skb > fields are on cold cachelines. > If the skb are linear and the kernel don't need to compute the udp > csum, only a handful of skb fields are required by udp_recvmsg(). > Since we already use skb->dev_scratch to cache hot data, and > there are 32 bits unused on 64 bit archs, use such field to cache > as much data as we can, and try to prefetch on dequeue the relevant > fields that are left out.
Acked-by: Eric Dumazet <eduma...@google.com>
