Re: in-driver QoS

[Vladimir Kondratiev <vkondra@mail.ru>]

How could I use these multiple qdiscs? If I use existing driver framework, I 
have hard_start_xmit, that represent single queue. Do you have any examples 
how driver can access qdiscs directly? I.e. I have 4 queues in the driver, I 
want to fill it separately, start/stop incoming queues from stack etc.

Note also, we are talking about 100Mbps above MAC, which translates to about 
150 Mbps, within next 2 years. 100Mbps above MAC is criteria for TGn working 
group in IEEE (high throughput).

Vladimir.

On Monday 07 June 2004 17:00, Andi Kleen wrote:
> > Any ideas how to modify stack to support multiple Tx queues?
>
> It already has that kind of in the form of arbitary qdiscs. The trick
> will be only to do all queueing in the qdisc and keep the hardware
> queue length as small as possible. I think today's drivers can
> do that already by just plugging the queue most of the time,
> unless they really want a packet.
>
> Disadvantage will be more use of CPU time to refill driver
> queues, but at the relatively slow WLAN speeds that shouldn't
> be a big issue.
>
> BTW the standard qdisc pfifo_fast already has three queues,
> selected by the old TOS.  That may even be good enough for you
> already. Users can fine tune it by using firewall rules
> that change the TOS for specific protocols etc.
>
> -Andi