mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
tcp_bbr: reset full pipe detection on loss recovery undo
Fix BBR so that upon notification of a loss recovery undo BBR resets the full pipe detection (STARTUP exit) state machine. Under high reordering, reordering events can be interpreted as loss. If the reordering and spurious loss estimates are high enough, this could previously cause BBR to spuriously estimate that the pipe is full. Since spurious loss recovery means that our overall sending will have slowed down spuriously, this commit gives a flow more time to probe robustly for bandwidth and decide the pipe is really full. 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>
This commit is contained in:
parent
c589e69b50
commit
2f6c498e4f
@ -874,6 +874,10 @@ static u32 bbr_sndbuf_expand(struct sock *sk)
|
||||
*/
|
||||
static u32 bbr_undo_cwnd(struct sock *sk)
|
||||
{
|
||||
struct bbr *bbr = inet_csk_ca(sk);
|
||||
|
||||
bbr->full_bw = 0; /* spurious slow-down; reset full pipe detection */
|
||||
bbr->full_bw_cnt = 0;
|
||||
return tcp_sk(sk)->snd_cwnd;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user