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qasdfdsaq · 18-03-2011, 20:33

Hmm interesting. I've managed 203mbps unidirectional (UDP) at 2x2 MIMO, using standard consumer kit (DIR-825 + Intel 5100 client). Better may be possible in a more optimal configuration as there were various limitations in my setup not related to the underlying technology.

I may have mis-quoted my own number on TCP throughput though. I managed 106mps TCP on 1x1 (non-MIMO) @150 rate and 137mbps TCP on 2x1 @300 rate, but was limited by CPU on one device. Extrapolating from my other scaling tests, 250mbps UDP and 210mbps TCP should be possible with better equipment and drivers. I saw a big drop in efficiency in the 2x2, 40Mhz configuration but this was seemingly the driver/CPU limitation as neither 2x2 or 40Mhz on it's own showed any drop in efficiency at all.

Mind you, 3x3 client cards are quite widely available and 3x3 APs/routers are just coming into the consumer space now, I'd be curious to see how they perform but early reports suggest they're even more CPU limited.

Got a reference to those IEEE tests? I'm surprised mine are so different, considering.

18-03-2011, 20:33	#134
qasdfdsaq cf.mega poster Join Date: Aug 2004 Posts: 11,207	Re: Finally arrives here ! Hmm interesting. I've managed 203mbps unidirectional (UDP) at 2x2 MIMO, using standard consumer kit (DIR-825 + Intel 5100 client). Better may be possible in a more optimal configuration as there were various limitations in my setup not related to the underlying technology. I may have mis-quoted my own number on TCP throughput though. I managed 106mps TCP on 1x1 (non-MIMO) @150 rate and 137mbps TCP on 2x1 @300 rate, but was limited by CPU on one device. Extrapolating from my other scaling tests, 250mbps UDP and 210mbps TCP should be possible with better equipment and drivers. I saw a big drop in efficiency in the 2x2, 40Mhz configuration but this was seemingly the driver/CPU limitation as neither 2x2 or 40Mhz on it's own showed any drop in efficiency at all. Mind you, 3x3 client cards are quite widely available and 3x3 APs/routers are just coming into the consumer space now, I'd be curious to see how they perform but early reports suggest they're even more CPU limited. Got a reference to those IEEE tests? I'm surprised mine are so different, considering.