netdev - Re: why does skb->tstamp use getnstimeofday?

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Message-ID: <op.v745mll4fzo5me@stalin>
Date:	Sun, 15 Jan 2012 23:55:23 +0400
From:	"Anatoly Sivov" <mm05@...l.ru>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: why does skb->tstamp use getnstimeofday?

> TCP stack doesnt use skb->tstamp/jtime_t, for example, but jiffies.
Some CA engines asks for RTT calculation with skb->tstamp.
They state about it by setting TCP_CONG_RTT_STAMP flag in their struct  
tcp_congestion_ops instances.

> For what kind of application or protocol do you feel there could be a
> problem ?
I don't insist on problems are here, just want to mark that there could be  
a problem with these CA engines
in the case of "big ntp adjustment".
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