linux-kernel - Re: eth_type_trans(): Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-Id: <20081117.230055.193685274.davem@davemloft.net>
Date:	Mon, 17 Nov 2008 23:00:55 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	mingo@...e.hu, torvalds@...ux-foundation.org, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	cl@...ux-foundation.org, efault@....de, a.p.zijlstra@...llo.nl,
	shemminger@...tta.com
Subject: Re: eth_type_trans(): Re: [Bug #11308] tbench regression on each
 kernel release from 2.6.22 -&gt; 2.6.28

From: Eric Dumazet <dada1@...mosbay.com>
Date: Tue, 18 Nov 2008 06:35:46 +0100

> David Miller a écrit :
> > From: Ingo Molnar <mingo@...e.hu>
> > Date: Mon, 17 Nov 2008 22:26:57 +0100
> > 
> >> eth->h_proto access.
> > Yes, this is the first time a packet is touched on receive.
> 
> Well, not exactly, since we do a 
> 
> if (is_multicast_ether_addr(eth->h_dest)) {
> ...}
> 
> and one of the
> 	compare_ether_addr(eth->h_dest, {dev->dev_addr | dev->broadcast})
> 
> probably its a profiling effect...

True.

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