netdev - Re: [PATCH] skbuff: Add new tc classify variable

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Message-ID: <20120207195729.GA26533@pandem0nium>
Date:	Tue, 7 Feb 2012 20:57:29 +0100
From:	Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] skbuff: Add new tc classify variable

On Tue, Feb 07, 2012 at 11:05:22AM -0800, Stephen Hemminger wrote:
> On Tue,  7 Feb 2012 19:39:08 +0100
> Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de> wrote:
> 
> I don't understand why this is better, we already have mark to do this.
> Your method saves adding a tc filter to map mark to classid, but that is hardly
> a huge burden.

Unfortunately, it is. We have previously built our trees by setting marks with iptables
and matching the masks with tc and the u32 matcher, but we got a rather big performance
impact as soon as the number of users grow. The target platform are WiFi access points.
By using the proposed patch, the performance stays nearly constant at a growing number
of users.

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