netdev - Re: [net-next-2.6 PATCH v2] net: implement mechanism for HW based QOS

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Date:	Mon, 20 Dec 2010 14:58:44 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	John Fastabend <john.r.fastabend@...el.com>, davem@...emloft.net,
	netdev@...r.kernel.org, hadi@...erus.ca, tgraf@...radead.org,
	eric.dumazet@...il.com, nhorman@...driver.com
Subject: Re: [net-next-2.6 PATCH v2] net: implement mechanism for HW based
 QOS

On Mon, 20 Dec 2010 22:48:07 +0000
Ben Hutchings <bhutchings@...arflare.com> wrote:

> > +	u8 num_tc;
> > +	struct netdev_tc_txq tc_to_txq[16];
> > +	u8 prio_tc_map[16];  
> 
> That seems like a fair amount of data to add to every net device,
> considering that users may create e.g. a lot of VLAN devices and they
> won't use this state at all.  Have you considered putting these in a
> structure that is accessed indirectly?

The tc stuff should use indirection and only allocate if needed.

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