linux-kernel - Re: Web10g TCP statistics patch

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Message-Id: <20130129.135222.864358079580838703.davem@davemloft.net>
Date:	Tue, 29 Jan 2013 13:52:22 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	Valdis.Kletnieks@...edu, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, web10g-user@...10g.org
Subject: Re: Web10g TCP statistics patch - mainlining into kernel?

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Tue, 29 Jan 2013 17:49:15 +0000

> On Fri, 2013-01-25 at 13:31 -0500, Valdis Kletnieks wrote:
> [...]
>> it's a zero-hit thing for people who don't choose to configure
>> it into their kernel.
> [...]
> 
> People with high-overhead changes always say this, but before long
> distributions will be expected to enable it and then everyone pays the
> price.  So I think you'll have to work on limiting the run-time overhead
> when it's enabled at compile time but the user doesn't care about it.
> Possibly it can be a run-time option?  (I haven't looked at the code and
> don't expect to have time to do so.)

+1

The run time overhead must be zero when the feature is configured into
the kernel, and this requirement is non-negotiable.
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