netdev - Re: [PATCH net-next] tcp: ignore rcv_rtt sample with old ts ecr value

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Message-Id: <20180622.134551.258586424493469487.davem@davemloft.net>
Date:   Fri, 22 Jun 2018 13:45:51 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     weiwan@...gle.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, ncardwell@...gle.com
Subject: Re: [PATCH net-next] tcp: ignore rcv_rtt sample with old ts ecr
 value

From: Wei Wang <weiwan@...gle.com>
Date: Tue, 19 Jun 2018 21:42:50 -0700

> From: Wei Wang <weiwan@...gle.com>
> 
> When receiving multiple packets with the same ts ecr value, only try
> to compute rcv_rtt sample with the earliest received packet.
> This is because the rcv_rtt calculated by later received packets
> could possibly include long idle time or other types of delay.
> For example:
> (1) server sends last packet of reply with TS val V1
> (2) client ACKs last packet of reply with TS ecr V1
> (3) long idle time passes
> (4) client sends next request data packet with TS ecr V1 (again!)
> At this time, the rcv_rtt computed on server with TS ecr V1 will be
> inflated with the idle time and should get ignored.
> 
> Signed-off-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.