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| author | Eric Dumazet <edumazet@google.com> | 2013-10-01 10:23:44 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-02 16:45:17 -0400 |
| commit | 6ae705323b716ea7a8cc26bee79176398a9b2e89 (patch) | |
| tree | e3b90b1519e5b90a6d3ec8b21493c804da185b76 /net/ipv4/tcp_ipv4.c | |
| parent | bbe34cf8a1a2cc174e6516fc230b91b531da7ddf (diff) | |
| download | linux-6ae705323b716ea7a8cc26bee79176398a9b2e89.tar.bz2 | |
tcp: sndbuf autotuning improvements
tcp_fixup_sndbuf() is underestimating initial send buffer requirements.
It was not noticed because big GSO packets were escaping the limitation,
but with smaller TSO packets (or TSO/GSO/SG off), application hits
sk_sndbuf before having a chance to fill enough packets in socket write
queue.
- initial cwnd can be bigger than 10 for specific routes
- SKB_TRUESIZE() is a bit under real needs in some cases,
because of power-of-two rounding in kmalloc()
- Fast Recovery (RFC 5681 3.2) : Cubic needs 70% factor
- Extra cushion (application might react slowly to POLLOUT)
tcp_v4_conn_req_fastopen() needs to call tcp_init_metrics() before
calling tcp_init_buffer_space()
Then we realize tcp_new_space() should call tcp_fixup_sndbuf()
instead of duplicating this stuff.
Rename tcp_fixup_sndbuf() to tcp_sndbuf_expand() to be more
descriptive.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index b14266bb91eb..5d6b1a609da8 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1410,8 +1410,8 @@ static int tcp_v4_conn_req_fastopen(struct sock *sk, inet_csk(child)->icsk_af_ops->rebuild_header(child); tcp_init_congestion_control(child); tcp_mtup_init(child); - tcp_init_buffer_space(child); tcp_init_metrics(child); + tcp_init_buffer_space(child); /* Queue the data carried in the SYN packet. We need to first * bump skb's refcnt because the caller will attempt to free it. |