From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 22 Jul 2013 23:20:46 +0000 (-0700)
Subject: tcp: prefer packet timing to TS-ECR for RTT
X-Git-Tag: v3.12-rc1~132^2~485^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b08e47caf1f2034a3a5b566bbccc8b0be3961ca;p=pandora-kernel.git

tcp: prefer packet timing to TS-ECR for RTT

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@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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