Fixed rate for ath9k

Fixed rate for ath9k

[Antonis Hadjiantonis]

Hello,

I am experimenting with Rate Control of ath9k (minstrel_ht) and tried to fix the
rate to a value. I fix it to an index (e.g. 2) using the relevant patch and
debugfs and confirm the value is changed:
echo 2 > /sys/kernel/debug/ieee80211/phy0/rc/fixed_rate_idx

It seems though the value is ignored, and minstrel RC works unaffected:
>From the rcstat file:
rate     throughput  ewma prob   this prob  this succ/attempt success  attempts
     1         0.1       15.5       50.0          0(  0)         23         121
     2         0.4       25.0      100.0          0(  0)          1           1
     5.5       0.0        0.0        0.0          0(  0)          0           0
  P 11         4.5       47.9       85.7         24( 28)        334         737
     6         1.3       24.6        0.0          0(  0)          2           8
     9         1.5       18.7        0.0          0(  0)          1           5
    12         2.1       19.2        0.0          0(  0)          3          22
    18         1.8       11.0        0.0          0(  0)         96         311
 t  24         6.5       30.9      100.0          1(  1)         14         151
T   36         8.7       28.8      100.0          1(  1)        157         822
    48         1.4        3.8        0.0          0(  0)         85         421
    54         1.9        4.3        0.0          0(  0)      18336       19723

I am using OpenWrt Backfire (10.03.1, r29592) on a WRT160nl and connect with it
over 802.11g using iperf on a smartphone.

As this is my first ever post on the list, please be nice :)

Thanks in advance,
Antonis