netdev - why does skb->tstamp use getnstimeofday?

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Date:	Sun, 15 Jan 2012 19:11:31 +0400
From:	"Anatoly Sivov" <mm05@...l.ru>
To:	netdev@...r.kernel.org
Subject: why does skb->tstamp use getnstimeofday?

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?

Thank you.
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