Messages in this thread | | | Date | Thu, 28 Aug 2008 00:39:52 +0200 | From | Andi Kleen <> | Subject | Re: loaded router, excessive getnstimeofday in oprofile |
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On Wed, Aug 27, 2008 at 03:18:24PM -0700, David Miller wrote: > From: Andi Kleen <andi@firstfloor.org> > Date: Wed, 27 Aug 2008 18:27:35 +0200 > > > > Those banks really want to crank down on latency - to the point they > > > start disabling interrupt coalescing. I bet they'd toss anything out > > > they could to shave another microsecond. > > > > This change would actually likely lower their latency. > > They want the timestamps, but they want it to match when the packet > arrived at their system as closely as is reasonably possible.
Then they should use hardware time stamps which are increasingly available (e.g. current Intel e1000 design has them and I expect others too).
-Andi
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