[LARTC] QoS + TOS field

[Andy Furniss]

Sergiy Lozovsky wrote:
> Hi,
> 
> I'm trying to figure out how to use Linux QoS. Default
> setting has three queues (bands) and should prioretise
> outgoing tarffic based on TOS field. I try to test
> that by flooding Ethernet interface by netperf or
> iptraf and running ping -f with -Q and without Q. -Q
> doesn't affect ping results, it suffers anyway. It
> seems that I don't understand something. I verified
> that -Q traffic goes through higher prority queue.
> 
> I can make it work if I shape traffic at lower
> priority queue, but I would like to avoid that,
> becuase can't always predict bandidth of connection.
> 
> I would appreciate any insight on that.

Works for me - well if you don't shape then you will have a nic driver 
dependant buffer after the queue maybe yours is bigger - but if you 
start enough tcps to get a big backlog then you should be able see the 
difference.

Andy.