26.03.2018 12:35, Stanislaw Gruszka:

Hi Mathias

quoted

sorry for the delayed testing. I had to create a new test setup
first, fought with buggy hardware and was busy with other stuff.

Thanks for doing it.

quoted

The two attached patches are causing a performance regression for me again:

OpenWrt head (forced HT40, 100Mbit wired interface)

wireless (iperf client) to wired (iperf server)
   Interval           Transfer     Bitrate         Retr
     0.00-60.00  sec   584 MBytes  81.6 Mbits/sec  666           sender
     0.00-60.00  sec   584 MBytes  81.6 Mbits/sec                receiver

wired (iperf client) to wireless (iperf server)
   Interval           Transfer     Bitrate         Retr
     0.00-60.00  sec   620 MBytes  86.7 Mbits/sec   33           sender
     0.00-60.00  sec   617 MBytes  86.2 Mbits/sec                receiver



OpenWrt head (forced HT40, 100Mbit wired interface)
   + rt2800_change_rx_ampdu_factor.patch
   + rt2800_change_ba_size.patch

wireless (iperf client) to wired (iperf server)
   Interval           Transfer     Bitrate         Retr
     0.00-60.00  sec   356 MBytes  49.8 Mbits/sec    6           sender
     0.00-60.00  sec   356 MBytes  49.7 Mbits/sec                receiver

wired (iperf client) to wireless (iperf server)
   Interval           Transfer     Bitrate         Retr
     0.00-60.00  sec   627 MBytes  87.7 Mbits/sec    5           sender
     0.00-60.00  sec   626 MBytes  87.5 Mbits/sec                receiver


Due to the regression I haven't tested your ampdu_density patch so
far. Let me hear if you want to see more tests done.

Could you test just RX AMPDU patches, i.e.

rt2800_change_rx_ampdu_factor.patch
rt2800_change_rx_ampdu_density.patch

I have somewhat positive results on RX performance on some devices
with those. Perhaps you could confirm that :-)

This time I've done the test with HT20 only, to not annoy my neighbours.

The test setup is the following:

ath9k (STA) <=> (AP) o2 Box 6431 (RJ45) <=> desktop

With the patches applied the bandwidth is somewhat around 10 MBit/sec 
lower. Even if I was able to reliable reproduce it, I'm not sure if it 
is within the measuring tolerance.


OpenWrt head

   mkresin@desktop ~ $ iperf3 -c 192.168.1.156
   Connecting to host 192.168.1.156, port 5201
   Interval           Transfer     Bandwidth       Retr
     0.00-10.00  sec  89.5 MBytes  75.0 Mbits/sec    1           sender
     0.00-10.00  sec  88.2 MBytes  74.0 Mbits/sec                receiver

   mkresin@desktop ~ $ iperf3 -c 192.168.1.156 -R
   Connecting to host 192.168.1.156, port 5201
   Reverse mode, remote host 192.168.1.156 is sending
   Interval           Transfer     Bandwidth       Retr
     0.00-10.00  sec  70.8 MBytes  59.4 Mbits/sec    0           sender
     0.00-10.00  sec  70.5 MBytes  59.1 Mbits/sec                receiver

OpenWrt head
  + rt2800_change_rx_ampdu_factor.patch
  + rt2800_change_rx_ampdu_density.patch

mkresin@desktop ~ $ iperf3 -c 192.168.1.156
   Connecting to host 192.168.1.156, port 5201
   Interval           Transfer     Bandwidth       Retr
     0.00-10.00  sec  78.2 MBytes  65.6 Mbits/sec    0           sender
     0.00-10.00  sec  77.1 MBytes  64.7 Mbits/sec                receiver

mkresin@desktop ~ $ iperf3 -c 192.168.1.156 -R
   Connecting to host 192.168.1.156, port 5201
   Reverse mode, remote host 192.168.1.156 is sending
   Interval           Transfer     Bandwidth       Retr
     0.00-10.00  sec  51.8 MBytes  43.5 Mbits/sec    1           sender
     0.00-10.00  sec  51.7 MBytes  43.3 Mbits/sec                receiver

Mathias