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.
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
Eric Dumazet (4):
tcp: hint compiler about sack flows
tcp: take care of compressed acks in tcp_add_reno_sack()
tcp: make tcp_space() aware of socket backlog
tcp: implement coalescing on backlog queue
include/net/tcp.h | 4 +-
include/uapi/linux/snmp.h | 1 +
net/ipv4/proc.c | 1 +
net/ipv4/tcp_input.c | 58 +++++++++++++++-----------
net/ipv4/tcp_ipv4.c | 88 ++++++++++++++++++++++++++++++++++++---
5 files changed, 119 insertions(+), 33 deletions(-)
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2.20.0.rc0.387.gc7a69e6b6c-goog
