Ratecontrol 1 Mbps

[Matteo]

Uhm, I tried with iperf with 30s and I monitored the bitrate and it stayed at 1 Mbps
However, I found the some problem with ath5k.

This is the rc_stats table of a single station :
rate     throughput  ewma prob   this prob  this succ/attempt   success    attempts
TtP  1         0.0        0.0        0.0          0(  0)          0           0
     2         0.0        0.0        0.0          0(  0)          0           0
     5.5       0.0        0.0        0.0          0(  0)          0           0
    11         0.0        0.0        0.0          0(  0)          0           0
     6         0.0        0.0        0.0          0(  0)          0           0
     9         0.0        0.0        0.0          0(  0)          0           0
    12         0.0        0.0        0.0          0(  0)          0           0
    18         0.0        0.0        0.0          0(  0)          0           0
    24         0.0        0.0        0.0          0(  0)          0           0
    36         0.0        0.0        0.0          0(  0)          0           0
    48         0.0        0.0        0.0          0(  0)          0           0
    54         0.0        0.0        0.0          0(  0)          0           0

Total packet count::    ideal 0      lookaround 0

and sometimes I found only the first row without  other rows.

TtP  1         0.0        0.0        0.0          0(  0)          0           0
Total packet count::    ideal 0      lookaround 0

It seems that the rc_control algorithm sometimes does not work well

Matteo

On Oct 11, 2013, at 9:15 AM, Oleksij Rempel <linux at rempel-privat.de> wrote:

> Am 11.10.2013 00:06, schrieb Matteo:
>> Hi all,
>> I created an IBSS network with 5 nodes.
>> A couple of nodes are Android tablet Nexus 7 (2012) with kernel version 3.2.x where I plugged a TPlink-722N so ath9k_htc driver. The remaining nodes have ath5k driver.
>> I modified the firmware in a couple of points to report the bitrate into ath9k_htc/tgt_tx_status file.
>> Sometimes I noticed  that during the data transmission the bitrate stay fixed to1 Mbps and I don't know why. I thought that the common behavior was to try different bitrate. 
>> Instead sometimes I can look different bitrate during the data transmission.
>> Do I need update the driver? Is it common with IBSS mode?
> 
> Hi Matteo,
> 
> if link is inactive for some time (10 second?), the tx bitrate will drop
> to 1 Mbit/s.
> 
> -- 
> Regards,
> Oleksij