netdev - Re: [PATCH v2 0/2] Tracepoint for tcp retransmission

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Message-ID: <1328548706.2200.17.camel@gandalf.stny.rr.com>
Date:	Mon, 06 Feb 2012 12:18:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hagen Paul Pfeifer <hagen@...u.net>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Satoru Moriya <satoru.moriya@....com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"tgraf@...radead.org" <tgraf@...radead.org>,
	"stephen.hemminger@...tta.com" <stephen.hemminger@...tta.com>,
	Seiji Aguchi <seiji.aguchi@....com>, fche@...rceware.org,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [PATCH v2 0/2] Tracepoint for tcp retransmission

On Mon, 2012-02-06 at 18:02 +0100, Eric Dumazet wrote:
>  
> > I haven't looked at the details here, but I'm wondering if netfilter
> > could benefit from static_branch() calls (aka jump-labels). I'm sure
> > selinux could too. Basically, when netfilter is disabled, the fast path
> > would just include a nop, with no if() branch testing at all. When you
> > enable netfilters, it would then add a jmp to the code that actually
> > does the tests.
> 
> Hmm... I thought I already did that.
> 
> Or maybe I intended so and forgot.
> 
> Ah no, its there in commit a2d7ec58ac09
> (netfilter: use jump_label for nf_hooks)

hehe, this shows the fact that "I haven't looked at the details here".

;-)

Great to hear!

-- Steve


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