linux-kernel - Re: [PATCH net-next] tcp: add ability to set a timestamp offset

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Message-Id: <20130213.132254.1534641136664469265.davem@davemloft.net>
Date:	Wed, 13 Feb 2013 13:22:54 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	avagin@...nvz.org
Cc:	netdev@...r.kernel.org, criu@...nvz.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	edumazet@...gle.com, xemul@...allels.com
Subject: Re: [PATCH net-next] tcp: add ability to set a timestamp offset

From: Andrey Vagin <avagin@...nvz.org>
Date: Mon, 11 Feb 2013 19:50:16 +0400

> If a TCP socket will get live-migrated from one box to another the
> timestamps (which are typically ON) will get screwed up -- the new
> kernel will generate TS values that has nothing to do with what they
> were on dump. The solution is to yet again fix the kernel and put a
> "timestamp offset" on a socket.
> 
> A socket offset is added in places where externally visible tcp
> timestamp option is parsed/initialized.
> 
> Connections in the SYN_RECV state are not supported, global
> tcp_time_stamp is used for them, because repair mode doesn't support
> this state. In a future it can be implemented by the similar way as for
> TIME_WAIT sockets.
> 
> For time-wait sockets offset is inhereted by a proper tcp_sock.
> 
> A per-socket offset can be set only for sockets in repair mode.

Series applied, thanks.
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