On 05/31/2012 12:24 PM, Adrian Chadd wrote:

.. yup, I got it to 250MBit UDP. :-)

It turns out that (at least in FreeBSD-9), the scheduler and sleep
state behaviour when doing adaptive power save/sleep state (ie,
adaptive CPU speed changes, going into C2) is enough to negatively
impact my iperf and ath/net80211 taskqueue scheduling.

When I nail it back up to C1, fixed speed - everything is perfectly fine.

I'll go and do some further digging into this, but it's good to see
that I can squeeze decently high throughput out of the 2x2 NICs.

I'm getting right at 250Mbps of UDP payload received when
using a 2x2 AR9382 NIC (WPEA-121N) in a Lenovo X220i (with hacked white-listed BIOS).
AP is a 3x3 AR9380 NIC (WPEA_127N) in Atom based network appliance.

Open-air connection, about 3 feet apart.  This is in
the 'download' direction:  Wired to Station.  HT-40 on 5Ghz.

The rates bounce around a bit...down to 240Mbps or so for a bit, then
back to 250Mbps.  Might be some other interference around as this is
a relatively noisy environment...

Upload speed seems to be a constant 243Mbps..at least at this moment.

Kernel is 3.3.7+.


Thanks,
Ben

-- 
Ben Greear [off-list ref]
Candela Technologies Inc  http://www.candelatech.com