On Fri, May 29, 2009 at 1:07 PM, Jeppe Øland <[email protected]> wrote:
> So... if a priorice a host over alll, why if I do a ping from the priorized >> hots I have 27 millisenconds, but when from othre host in the LAN I upload a >> file, the latency of the icmp grows to 220-270? >> > > Yes that is normal. > Unless you also set ICMP to use a high-priority queue, it will go in the > same queue as the upload. > VOIP should still go in the high priority one. > > You can try something like www.testyourvoip.com from your PC and see what > latency it reports with/without an upload running at the same time. > > You can also make a VOIP call and look at the Status/Queues graphs ... all > the VOIP traffic should go to the higher priority queue, and the upload > should be in the default one. > Definitely check your queues. My experience is that even higher priority packets show increased latency when the queue is full. I suppose it has to do with the length of the queue, or perhaps the increased load of sorting the queue when busy. At the same time, I have found that the ill effects on voip are imperceptible. In other words, if your QoS is properly set up, you may see the numbers change, but the subjective experience should be little to no different regardless of how busy the network is. db
