netdev - Re: RFC: possible NAPI improvements to reduce interrupt rates for low traffic rates

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Date:	Mon, 10 Sep 2007 10:25:57 +0100
From:	James Chapman <jchapman@...alix.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	netdev@...r.kernel.org, hadi@...erus.ca, davem@...emloft.net,
	jeff@...zik.org, mandeep.baines@...il.com, ossthema@...ibm.com
Subject: Re: RFC: possible NAPI improvements to reduce interrupt rates for
 low traffic rates

Andi Kleen wrote:
> James Chapman <jchapman@...alix.com> writes:

> On some platforms the precise timers (like ktime_get()) can be slow,
> but often they are fast.  It might make sense to use a shorter
> constant time wait on those with fast timers at least. Right now this
> cannot be known by portable code, but there was a proposal some time
> ago to export some global estimate to tell how fast
> ktime_get().et.al. are. That could be reviewed.

Interesting. Is ktime_get() fast enough on P4 systems? I'll be using 
those to test with.

-- 
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development

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