DragonFly-2.3.2.186.g5b0b9 master sys/kern uipc_socket.c uipc_so
commit 5b0b9fa51337cb0f3a9c78c8f74fbe4be19d719e
Author: Peter Avalos <pavalos@theshell.com>
Date: Sun Jul 19 15:50:00 2009 -1000
Implement autosizing TCP socket buffers.
Normally the socket buffers are static (either derived from global
defaults or set with setsockopt) and do not adapt to real network
conditions. Two things happen: a) your socket buffers are too small
and you can't reach the full potential of the network between both
hosts; b) your socket buffers are too big and you waste a lot of
kernel memory for data just sitting around.
With automatic TCP send and receive socket buffers we can start with a
small buffer and quickly grow it in parallel with the TCP congestion
window to match real network conditions.
New sysctls are:
net.inet.tcp.sendbuf_auto=1 (enabled)
net.inet.tcp.sendbuf_inc=8192 (8K, step size)
net.inet.tcp.sendbuf_max=16777216 (16M, growth limit)
net.inet.tcp.recvbuf_auto=1 (enabled)
net.inet.tcp.recvbuf_inc=16384 (16K, step size)
net.inet.tcp.recvbuf_max=16777216 (16M, growth limit)
Additionally, add limiters and sanity checks for TCP MSS (maximum segment
size) resource exhaustion attacks.
Obtained-from: FreeBSD
Summary of changes:
sys/kern/uipc_socket.c | 6 ++
sys/kern/uipc_socket2.c | 8 ++-
sys/kern/uipc_usrreq.c | 2 +-
sys/netinet/tcp.h | 19 ++++++
sys/netinet/tcp_input.c | 145 +++++++++++++++++++++++++++++++++++++++++++++-
sys/netinet/tcp_output.c | 69 +++++++++++++++++++++-
sys/netinet/tcp_subr.c | 24 ++++++++
sys/netinet/tcp_usrreq.c | 5 +-
sys/netinet/tcp_var.h | 11 ++++
sys/sys/socketvar.h | 1 +
10 files changed, 281 insertions(+), 9 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5b0b9fa51337cb0f3a9c78c8f74fbe4be19d719e
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