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

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Message-ID: <1326645750.5287.48.camel@edumazet-laptop>
Date:	Sun, 15 Jan 2012 17:42:30 +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 19:11 +0400, Anatoly Sivov a écrit :
> Hello everyone.
> 
> struct sk_buff has a field tstamp, which is used for high resolution rtt  
> calculation.
> All operations with this field are done directly or indirectly via ktime_*  
> interface,
> which uses getnstimeofday function.
> My question is why does skb->tstamp use getnstimeofday?
> Isn't it better to use getrawmonotonic, where we are not inetrfered with  
> ntp,  for rtt calculation?
> 

It's using this since day 0, so cannot be changed or break applications,
which expect timeofday, not monotonic.

monotonic time services were added later.

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