Performance of AR9287

[Johann Hugo]

On Saturday 22 September 2012 02:05:23 Derrick Edwards wrote:
>      Thanks again for looking into this.
> My main concern was the range of network performance that I was getting
> when  the laptop was right in front of the access point. As you can see
> bandwith varied greatly.

I don't know if it's related, but my RSSI and RATE jumps around quite a lot 
while transfering a large file. 

Output from loop doing "ifconfig wlan0 list sta" while transfering a big file.

ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 16.5    0    842   9440 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  43M 12.5    0   1063  14784 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  43M 15.5    0   1362  21088 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 15.5    0   1627  27488 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 13.5    0   2150  38976 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 11.5    0   2289  42384 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  29M 24.5    0   3075  60016 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 28.5    0   3369   1600 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  86M 14.0    0   3839  11744 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  29M 13.5    0     87  19936 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  58M 11.5    0    403  27440 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  58M 12.5    0    758  35200 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  58M 11.0    0   1054  42320 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  58M 23.5    0   1249  46512 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  29M 11.0    0   1381  49312 E    AQHTR   HTCAP 
WME
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS FLAG   
00:0c:42:6c:58:29    1  128  58M 11.5    0   1584  54224 E    AQHTR   HTCAP 
WME

System info = hybrid
HW = gateworks ARM
OS = FreeBSD-9 with ath code from current
Wifi = RouterBOARD R52nM = AR9220
Distance = 8km

B.t.w if I use the same HW with FreeBSD-9 in 11a mode, then RSSI does not jump 
around and I get about the same throuput as with N.

I don't have any athstats output, still working on it.

Johann