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| author |   Kevin Yang <yyd@google.com> | 2018-08-22 17:43:16 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-08-22 21:45:32 -0700 |
| commit | 8e995bf14fdb7e33681d5c3312b602fa342b878a (patch) | |
| tree | ce51c37366551d55e5c7a3ae22f9849ec918c57a /net/ipv4/udp_impl.h | |
| parent | tcp_bbr: in restart from idle, see if we should exit PROBE_RTT (diff) | |
| download | linux-dev-8e995bf14fdb7e33681d5c3312b602fa342b878a.tar.xz linux-dev-8e995bf14fdb7e33681d5c3312b602fa342b878a.zip | |
tcp_bbr: apply PROBE_RTT cwnd cap even if acked==0
This commit fixes a corner case where TCP BBR would enter PROBE_RTT
mode but not reduce its cwnd. If a TCP receiver ACKed less than one
full segment, the number of delivered/acked packets was 0, so that
bbr_set_cwnd() would short-circuit and exit early, without cutting
cwnd to the value we want for PROBE_RTT.
The fix is to instead make sure that even when 0 full packets are
ACKed, we do apply all the appropriate caps, including the cap that
applies in PROBE_RTT mode.
Fixes: 0f8782ea1497 ("tcp_bbr: add BBR congestion control")
Signed-off-by: Kevin Yang <yyd@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp_impl.h')
0 files changed, 0 insertions, 0 deletions