From: Eric Dumazet <eduma...@google.com> Date: Tue, 27 Nov 2018 14:41:59 -0800
> While working on the SACK compression issue Jean-Louis Dupond > reported, we found that his linux box was suffering very hard > from tail drops on the socket backlog queue. > > First patch hints the compiler about sack flows being the norm. > > Second patch changes non-sack code in preparation of the ack > compression. > > Third patch fixes tcp_space() to take backlog into account. > > Fourth patch is attempting coalescing when a new packet must > be added to the backlog queue. Cooking bigger skbs helps > to keep backlog list smaller and speeds its handling when > user thread finally releases the socket lock. > > v3: Neal/Yuchung feedback addressed : > Do not aggregate if any skb has URG bit set. > Do not aggregate if the skbs have different ECE/CWR bits > > v2: added feedback from Neal : tcp: take care of compressed acks in > tcp_add_reno_sack() > added : tcp: hint compiler about sack flows > added : tcp: make tcp_space() aware of socket backlog Series applied, thanks Eric. I'll push this out after the build check finishes.
