Re: Low latency communication over wifi

[Johannes Berg <johannes@sipsolutions.net>]

On Wed, 2015-09-30 at 19:24 +0200, Pavel Machek wrote:
> On Mon 2015-09-28 09:41:43, Johannes Berg wrote:
> > On Sat, 2015-09-26 at 12:24 +0200, Pavel Machek wrote:
> > > 
> > > That would be equivalent to ping -Q, right? It does not seem to have
> > > any effect :-(. I'd expect at least local machine to use shorter waits
> > > for medium, and thus drop packets instead of waiting.
> > 
> > Correct. But it won't *drop* packets, it just increases the chances of
> > getting medium access.
> 
> Increases chances of medium access, but limits number of retries, so
> it should drop sooner, no?

No, assigning VO AC by itself won't (typically) limit the number of
retries.

> This should send the second  ping to the priority queue based on -Q,
> but I don't see an effect against one access point.... and it seems to
> work somehow against second one. Good!
> 
Well it depends on whether or not your AP supports WMM/QoS to start
with :)

johannes