netdev - Re: [PATCH v2 net-next] net: use jump_label to shortcut RPS if not setup

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Message-ID: <1321568356.2444.7.camel@edumazet-laptop>
Date:	Thu, 17 Nov 2011 23:19:16 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH v2 net-next] net: use jump_label to shortcut RPS if not
 setup

Le jeudi 17 novembre 2011 à 17:04 -0500, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 17 Nov 2011 22:34:49 +0100
> 
> > I wonder if we could use this jump_label infrastructure to shortcut
> > expensive netfilter nf_hook_slow() / nf_iterate on empty
> > tables/chains...
> 
> That would be nice, I can't see why it wouldn't be possible.

Almost done :)

Only problem is arch_static_branch() has a "i" (key), so some calls wont
be optimized (hooknum in a variable, not a constant)

for example in nf_ct_frag6_output()

Not a big deal, most calls can be optimized away.



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