From: Yuchung Cheng <[email protected]>
Date: Fri, 7 Apr 2017 11:42:05 -0700
> The recent extension of F-RTO 89fe18e44 ("tcp: extend F-RTO
> to catch more spurious timeouts") interacts badly with certain
> broken middle-boxes. These broken boxes modify and falsely raise
> the receive window on the ACKs. During a timeout induced recovery,
> F-RTO would send new data packets to probe if the timeout is false
> or not. Since the receive window is falsely raised, the receiver
> would silently drop these F-RTO packets. The recovery would take N
> (exponentially backoff) timeouts to repair N packet losses. A TCP
> performance killer.
>
> Due to this unfortunate situation, this patch removes this extension
> to revert F-RTO back to the RFC specification.
>
> Fixes: 89fe18e44f7e ("tcp: extend F-RTO to catch more spurious timeouts")
> Signed-off-by: Yuchung Cheng <[email protected]>
> Signed-off-by: Neal Cardwell <[email protected]>
> Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
> Signed-off-by: Eric Dumazet <[email protected]>
Applied, thank you.
