Re: [RFT V2] rtl8187: Fix OFDM power settings for RTL8187L

[Larry Finger <Larry.Finger@lwfinger.net>]

Hauke Mehrtens wrote:
> With this patch included and pid the rate goes up to 24Mb/s, but the
> connection is stable. Without this patch is is only up to 11Mb/s. The
> connection is still unusable with minstrel, it goes up too fare. It
> starts with 24Mb/s and the connection drops. After some time it goes up
> to 54Mb/s, but then it goes down again and the connection is working
> again for a minute till the procedure begins again.
> 
> What do you mean with rc_stats ?

The statistics for the mistrel algorithn are presented in the /sys
tree in a file named rc_stats. The easy way to see that data is to do
the following:

STATS=$(find /sys -name rc_stats)
sudo cat $STATS

You will get output that looks like

rate     throughput  ewma prob   this prob  this succ/attempt
success    attempts
     1         0.9       99.9      100.0          0(  0)        855
      873
     2         1.8       95.7      100.0          0(  0)         11
       11
  P  5.5       5.0       99.9      100.0          0(  0)         77
       77
    11         9.1       95.9      100.0          0(  0)         14
       16
     6         5.4       95.6      100.0          0(  0)         16
       19
     9         8.0       95.7      100.0          0(  0)         11
       11
    12        10.6       95.7      100.0          0(  0)         11
       11
    18        15.5       95.7      100.0          0(  0)         11
       11
    24        20.4       96.0      100.0          0(  0)        276
      279
    36         5.9       96.0      100.0          0(  0)         76
       78
 t  48         6.5       76.5      100.0          0(  0)       2958
     3034
T   54        20.0       99.9      100.0          1(  1)       6220
     6400

Total packet count::    ideal 9216      lookaround 485

These data are for my RTL8187, which is running at 54 Mb/s (the line
with the T) and the success rate at this speed is 6220/6400 (97%).

Let the mistrel method go through several of those cycles that you
mention and then dump and post this table. Perhaps the experts will
see what is wrong.

Larry


Larry