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Date:	Fri, 26 Sep 2014 06:38:17 -0700
From:	Eric Dumazet <>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Tom Herbert <>,
	Jesper Dangaard Brouer <>,
	Linux Netdev List <>,
	"David S. Miller" <>,
	Alexander Duyck <>,
	Toke Høiland-Jørgensen <>,
	Florian Westphal <>,
	Jamal Hadi Salim <>,
	Dave Taht <>,
	John Fastabend <>,
	Daniel Borkmann <>,
	Hannes Frederic Sowa <>
Subject: RE: [net-next PATCH 1/1 V4] qdisc: bulk dequeue support for qdiscs

On Fri, 2014-09-26 at 13:16 +0000, David Laight wrote:

> OTOH it looks as though there is a big hit if you read then write
> a non-present cache line.

Well, this is exactly what it is about. Welcome to the club.

This is a well known problem.

Look at following old commit :

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