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

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Message-ID: <1326653813.5287.84.camel@edumazet-laptop>
Date:	Sun, 15 Jan 2012 19:56:53 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Anatoly Sivov <mm05@...l.ru>
Cc:	netdev@...r.kernel.org
Subject: Re: why does skb->tstamp use getnstimeofday?

Le dimanche 15 janvier 2012 à 21:55 +0400, Anatoly Sivov a écrit :

> I missed that field tstamp is used for things other than RTT and can be  
> even user-spaced with SO_TIMESTAMP.
> However, timekeeper speed up/slow down (due to ntp) can seriously affect  
> some congestion avoidance algorithm quality, I guess.
> Am I wrong?

For what kind of application or protocol do you feel there could be a
problem ?

TCP stack doesnt use skb->tstamp/jtime_t, for example, but jiffies.

ntp adjustements are normally very small and nobody notice.

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