Latency issue with a wireless USB adapter

[episyron]

I bought a D-Link DWA-127 wireless USB adapter for Raspberry Pi to stream music to a living room, but the adapter seems to have a latency issue. If I ping from the adapter to RT-N66U, I get a constant latency:

9 packets transmitted, 9 received, 0% packet loss, time 8013ms
rtt min/avg/max/mdev = 1.314/6.865/11.958/2.519 ms

But if I ping from RT-N66U to adapter, latencies are all over the place:

9 packets transmitted, 9 packets received, 0% packet loss
round-trip min/avg/max = 23.496/94.327/199.948 ms

This makes streaming, and actually any use difficult. Situation is the same if I use the adapter in my laptop. There are no other networks on a 2.4GHz channel I use, only my g and n devices. RT-N66U has a 3.0.0.4.374_168 fw.

Anyone seen this kind of uneven latencies? Any cure for this or is the adapter just a piece of crap?

 

[episyron]

I managed to resolve the latency issue by turning the power management of DWA-127 off. Now it is usable but did it help streaming? Not really. I guess if a sender and a receiver are in the same 2.4GHz band you can forget at least PCM audio streaming.

Anyone having ideas what settings for wireless could improve throughput? Signal quality is very good for both ends. If nothing else helps, I'll buy 5GHz wireless card for the desktop, so at least the serder and the receiver are on different bands.