netdev - rps: question

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Message-Id: <1265568122.3688.36.camel@bigi>
Date:	Sun, 07 Feb 2010 13:42:02 -0500
From:	jamal <hadi@...erus.ca>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	robert@...julf.net, David Miller <davem@...emloft.net>
Subject: rps: question

Hi Tom,

First off: Kudos on the numbers you are seeing; they are
impressive. Do you have any numbers on a forwarding path test?

My first impression when i saw the numbers was one of suprise.
Back in the days when we tried to split stack processing the way
you did(it was one of the experiments on early NAPI), IPIs were 
_damn_ expensive. What changed in current architecture that makes
this more palatable? IPIs are still synchronous AFAIK (and the more
IPI receiver there are, the worse the ACK latency). Did you test this
across other archs or say 3-4 year old machines?

cheers,
jamal 

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