netdev - Re: [PATCH 2/4 net-next] tcp: prefer packet timing to TS-ECR for RTT

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Message-ID: <CADVnQyntukzrVuF9XfN-=hxT1c32tLcCHTQWzo2t6+0EzKxb5A@mail.gmail.com>
Date:	Sun, 21 Jul 2013 23:17:44 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/4 net-next] tcp: prefer packet timing to TS-ECR for RTT

On Sun, Jul 21, 2013 at 1:39 AM, Yuchung Cheng <ycheng@...gle.com> wrote:
> Prefer packet timings to TS-ecr for RTT measurements when both
> sources are available. That's because broken middle-boxes and remote
> peer can return packets with corrupted TS ECR fields. Similarly most
> congestion controls that require RTT signals favor timing-based
> sources as well. Also check for bad TS ECR values to avoid RTT
> blow-ups. It has happened on production Web servers.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>

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