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| author |   Neal Cardwell <ncardwell@google.com> | 2015-03-10 17:17:03 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-03-11 16:51:51 -0400 |
| commit | 9949afa42be0b76f5832db112ce51bb6b35b2abb (patch) | |
| tree | dded55a25200f202f9904369f39ccad9769da00d /net/ipv4/tcp_cubic.c | |
| parent | MAINTAINERS: Update my email address (diff) | |
| download | wireguard-linux-9949afa42be0b76f5832db112ce51bb6b35b2abb.tar.xz wireguard-linux-9949afa42be0b76f5832db112ce51bb6b35b2abb.zip | |
tcp: fix tcp_cong_avoid_ai() credit accumulation bug with decreases in w
The recent change to tcp_cong_avoid_ai() to handle stretch ACKs
introduced a bug where snd_cwnd_cnt could accumulate a very large
value while w was large, and then if w was reduced snd_cwnd could be
incremented by a large delta, leading to a large burst and high packet
loss. This was tickled when CUBIC's bictcp_update() sets "ca->cnt =
100 * cwnd".
This bug crept in while preparing the upstream version of
814d488c6126.
Testing: This patch has been tested in datacenter netperf transfers
and live youtube.com and google.com servers.
Fixes: 814d488c6126 ("tcp: fix the timid additive increase on stretch ACKs")
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_cubic.c')
0 files changed, 0 insertions, 0 deletions