linux-kernel - Re: [PATCH] tcp: don't use timestamp from repaired skb-s to calculate RTT (v2)

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Message-Id: <20140814.143929.1671828120262010871.davem@redhat.com>
Date:	Thu, 14 Aug 2014 14:39:29 -0700 (PDT)
From:	David Miller <davem@...hat.com>
To:	avagin@...nvz.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	edumazet@...gle.com, xemul@...allels.com
Subject: Re: [PATCH] tcp: don't use timestamp from repaired skb-s to
 calculate RTT (v2)

From: Andrey Vagin <avagin@...nvz.org>
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
> TCPCB_RETRANS.
> 
> 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 <edumazet@...gle.com>
> Cc: Pavel Emelyanov <xemul@...allels.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Signed-off-by: Andrey Vagin <avagin@...nvz.org>

Applied.
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