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tcp_bbr: reset long-term bandwidth sampling on loss recovery undo

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[ Upstream commit 600647d467c6d04b3954b41a6ee1795b5ae00550 ]

Fix BBR so that upon notification of a loss recovery undo BBR resets
long-term bandwidth sampling.

Under high reordering, reordering events can be interpreted as loss.
If the reordering and spurious loss estimates are high enough, this
can cause BBR to spuriously estimate that we are seeing loss rates
high enough to trigger long-term bandwidth estimation. To avoid that
problem, this commit resets long-term bandwidth sampling on loss
recovery undo events.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Neal Cardwell 2017-12-07 12:43:32 -05:00 committed by Greg Kroah-Hartman
parent eb710b5f62
commit c7e9d72478
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/tcp_bbr.c
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@ -878,6 +878,7 @@ static u32 bbr_undo_cwnd(struct sock *sk)
bbr->full_bw = 0; /* spurious slow-down; reset full pipe detection */
bbr->full_bw_cnt = 0;
bbr_reset_lt_bw_sampling(sk);
return tcp_sk(sk)->snd_cwnd;
}