Subject: Re: multiple Tx queues
To: None <>
From: David Young <>
List: tech-net
Date: 01/11/2004 19:21:52
On Sat, Jan 10, 2004 at 07:15:53PM -0800, Sam Leffler wrote:
> On Saturday 10 January 2004 12:46 pm, Greg Troxel wrote:
> > Or are you talking about cards that have multiple queues, where each
> > queue is associated with a link-layer priority scheme (perhaps that
> > even extends across switches, e.g vlan-like qos tags - I'm not clear
> > on the standards here).
> The Atheros 5212-based cards support multiple xmit queues and implement a 
> variety of queueing policies in h/w.  This stuff is explicitly intended to 
> supoprt QoS as set out, for example, the WME spec.  Applications include VoIP 
> and streaming video.  To effectively use this stuff applications need to be 
> able to tag packets and have the OS stay out of the way except to not smash 
> the tag before it reaches the driver (where it can be used to select the 
> appropriate queue).

Interesting.  Are these "tags" in the abstract or VLAN tags?


David Young             OJC Technologies      Urbana, IL * (217) 278-3933