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Date:	Fri, 26 Sep 2014 10:47:32 +0200
From:	Jesper Dangaard Brouer <>
To:	Eric Dumazet <>
Cc:	Tom Herbert <>,
	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: [PATCH net-next] dql: dql_queued() should write first to reduce
 bus transactions

On Thu, 25 Sep 2014 23:04:56 -0700
Eric Dumazet <> wrote:

> It turned out the problem was caused by compiler trying to be
> smart, but involving a bad MESI transaction :
> I got an incredible 10 % gain [1] by making sure cpu do not attempt
> to get the cache line in Shared mode, but directly requests for
> ownership.
> Signed-off-by: Eric Dumazet <>
> ---

I'm very impressed - thank you Eric for finding this!!!

Acked-by: Jesper Dangaard Brouer <>

Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of
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