Re: broadcast latencies

From: Jouni Malinen (
Date: 2002-03-23 08:35:06 UTC

On Sat, Mar 23, 2002 at 12:28:35AM -0800, Thingly Transparence wrote:

> The CNFMULTICASTPMBUFFERING rid is set to 1 by
> default. The effect of this is that multicast /
> broadcast MAC frames are buffered for transmission
> after DTIM. If this is set to 0, the frames are
> directly placed in the output queue.

Yes and this is quite useful for stations that are using power saving..

> I changed the DTIMPERIOD to 1 and noticed a 3x
> improvement in latencies on broadcasts (to other APs
> as well as to clients).

I'll probably add a configuration option for setting this, since there are different needs based on the environment (whether there are PS stations, etc.).

> I also noticed that under /proc/net/prism2/wlan0/rids
> the CNFMULTICASTPMBUFFERING rid shows a read error.
> Any ideas on how to set this rid?

It is only supported on tertiary firmware AP.. I do not know, whether there would a mechanism (other than changing firmware) to override this in Host AP mode.

Jouni Malinen
SSH Communications Security Corp

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