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Date:	Thu, 14 Aug 2014 14:39:29 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH] tcp: don't use timestamp from repaired skb-s to
 calculate RTT (v2)

From: Andrey Vagin <>
Date: Wed, 13 Aug 2014 16:03:10 +0400

> We don't know right timestamp for repaired skb-s. Wrong RTT estimations
> isn't good, because some congestion modules heavily depends on it.
> This patch adds the TCPCB_REPAIRED flag, which is included in
> Thanks to Eric for the advice how to fix this issue.
> This patch fixes the warning:
> v2: moving setting of skb->when for repaired skb-s in tcp_write_xmit,
>     where it's set for other skb-s.
> Fixes: 431a91242d8d ("tcp: timestamp SYN+DATA messages")
> Fixes: 740b0f1841f6 ("tcp: switch rtt estimations to usec resolution")
> Cc: Eric Dumazet <>
> Cc: Pavel Emelyanov <>
> Cc: "David S. Miller" <>
> Signed-off-by: Andrey Vagin <>

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