Re: [PATCH v2 net-next] tcp: fix ABC in tcp_slow_start()

On Fri, Jul 20, 2012 at 8:07 AM, Yuchung Cheng [off-list ref] wrote:

On Fri, Jul 20, 2012 at 8:02 AM, Eric Dumazet [off-list ref] wrote:

quoted

From: Eric Dumazet <edumazet@google.com>

When/if sysctl_tcp_abc > 1, we expect to increase cwnd by 2 if the
received ACK acknowledges more than 2*MSS bytes, in tcp_slow_start()

Problem is this RFC 3465 statement is not correctly coded, as
the while () loop increases snd_cwnd one by one.

Add a new variable to avoid this off-by one error.

Signed-off-by: Eric Dumazet <edumazet@google.com>

Acked-by: Yuchung Cheng <redacted>

Acked-by: Neal Cardwell <ncardwell@google.com>

neal