tree 76ed742b563f89bc7cf99c025172811f1d2c1117
parent 61c51da2b4bd8abb2920f4dec0861a6fe5b8b486
author Neal Cardwell <ncardwell@google.com> 1512668612 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1515163591 +0100

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

commit 600647d467c6d04b3954b41a6ee1795b5ae00550 upstream.

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>