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

From: richard mayers <richard.mayers92@gmail.com>
To: ath10k@lists.infradead.org, Ben Greear <greearb@candelatech.com>
Subject: Cannot achieve throughput higher than 460Mbps using CT firmware and 3x3 ath10k
Date: Wed, 6 May 2015 17:01:06 +0200	[thread overview]
Message-ID: <CAMCCUbgZRhNCWTQkspCuRdCTQy6SpmihEKFHfY8ija4+zYTLiw@mail.gmail.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 1338 bytes --]

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.

[-- Attachment #2: hostapd80.conf --]
[-- Type: application/octet-stream, Size: 633 bytes --]

driver=nl80211
logger_syslog=127
logger_syslog_level=2
logger_stdout=127
logger_stdout_level=2
hw_mode=a
channel=149

ieee80211n=1
ht_capab=[HT40+][LDPC][SHORT-GI-20][SHORT-GI-40][TX-STBC][RX-STBC1][MAX-AMSDU-7935][DSSS_CCK-40]
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=155
ieee80211ac=1
vht_capab=[RXLDPC][SHORT-GI-80][TX-STBC-2BY1][RX-ANTENNA-PATTERN][TX-ANTENNA-PATTERN][RX-STBC1][MAX-MPDU-11454][MAX-A-MPDU-LEN-EXP7]

interface=wlan4
ctrl_interface=/var/run/hostapd
disassoc_low_ack=1
preamble=1
wmm_enabled=1
ignore_broadcast_ssid=0
uapsd_advertisement_enabled=1
auth_algs=1
wpa=0
ssid=wirelessAC
bssid=04:f0:21:11:e6:76

[-- Attachment #3: Type: text/plain, Size: 146 bytes --]

_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k