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 [off-list ref] 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.