On Tue, Feb 26, 2019 at 10:42:39AM -0800, Eric Dumazet wrote: > Avoid cache line miss dereferencing struct page if we can. > > page_copy_sane() mostly deals with order-0 pages. > > Extra cache line miss is visible on TCP recvmsg() calls dealing > with GRO packets (typically 45 page frags are attached to one skb). > > Bringing the 45 struct pages into cpu cache while copying the data > is not free, since the freeing of the skb (and associated > page frags put_page()) can happen after cache lines have been evicted.
Applied.
