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Message-Id: <200808281045.03460.nickpiggin@yahoo.com.au> Date: Thu, 28 Aug 2008 10:45:03 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Andi Kleen <andi@...stfloor.org> Cc: David Miller <davem@...emloft.net>, rick.jones2@...com, johnpol@....mipt.ru, dada1@...mosbay.com, denys@...p.net.lb, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: loaded router, excessive getnstimeofday in oprofile On Thursday 28 August 2008 08:39, Andi Kleen wrote: > On Wed, Aug 27, 2008 at 03:18:24PM -0700, David Miller wrote: > > From: Andi Kleen <andi@...stfloor.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). Would it make sense to make a new option for these socket timestamps and encourage some apps move over to it? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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