Cannot achieve throughput higher than 460Mbps using CT firmware and 3x3 ath10k

[richard mayers]

Hi all,

The maximum throughput I get with the following set up is around
460-470Mbits/s when using MCS 6, 80MHz channel and 3 spatial streams.
However, when I try MCS 7, the throughput drops to 200Mbits/s, and
when I use 8 or 9 it goes to 0. The signal level is -11dBm which I
guess is quite good.

Do you have any indications of what I do wrong and cannot get 600Mbps
throughput, as mention in previous messages in this list? Any help is
highly appreciated.

My set up is as follows:

- STA: compex wle900vx (QCA988x), ubuntu 14.04 LTS, dell dual core
1.66ghz, kernel version 3.16, driver backport 4.0.1 and as a firmware
the commercial firmware from Candela Tech (
10.4.467-ct-com-full-013-b5b14a).

- AP: Has the same set up, but is running hostapd with the
configuration file that you can find attached.

- I tried with many distances, but to make it easier now I have them
placed 50cm from each other (with no obstacles in between), with
3-antenna array and each antenna separated 12 cm from each other.

- For the throughput tests I use iperf (UDP). I run the server in the
AP, and the client in the station (upload). Command used in the client
: "iperf -c <IP> -i 1 -b 600m -S 0x08".

I also tried different drivers, kernels, firmware, distances between
STA and AP, kernel sockets buffers, etc.. But I can not get better
results.
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