Re: rt61pci - bad performance

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From: Andreas
Date: Thursday, August 26, 2010 - 10:36 am

Helmut Schaa wrote:

Ok, I tested this patch against the opensSuSE compat-wireless-2.6.35-1. 
First of all, the problem with the wrong tx-power disappeared:

wlan0     IEEE 802.11bg  ESSID:"...."
           Mode:Managed  Frequency:2.412 GHz  Access Point: ...
           Bit Rate=54 Mb/s   Tx-Power=20 dBm
           Retry  long limit:7   RTS thr:off   Fragment thr:off
           Encryption key:off
           Power Management:off
           Link Quality=36/70  Signal level=-74 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:0   Missed beacon:0


But the problem with bad transfer rates got worse:

from server -> client (download)
rate     throughput  ewma prob   this prob  this succ/attempt   success 
    attempts
      1         0.8       89.9      100.0          0(  0)         25 
       25
      2         1.8       95.7      100.0          0(  0)         11 
       11
      5.5       4.8       95.7      100.0          0(  0)         11 
       11
     11         9.1       95.7      100.0          0(  0)         11 
       11
      6         5.5       96.8      100.0          0(  0)         12 
       12
      9         8.0       95.7      100.0          0(  0)        123 
      123
     12        10.6       95.7      100.0          0(  0)         11 
       11
     18        15.5       95.7      100.0          0(  0)         11 
       11
     24        20.3       95.7      100.0          0(  0)         11 
       11
     36        29.1       95.7      100.0          0(  0)         11 
       11
  t  48        37.4       95.7      100.0          0(  0)         11 
       11
T P 54        43.3       99.9      100.0          2(  2)      71701 
   71776

Total packet count::    ideal 1924      lookaround 101

netperf -t TCP_MAERTS -H client
TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET client (....) port 
0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

  87380  16384  16384    10.61      10.61


from client to server (upload)

rate     throughput  ewma prob   this prob  this succ/attempt   success 
    attempts
      1         0.8       89.9      100.0          0(  0)         25 
       25
      2         1.8       95.7      100.0          0(  0)         11 
       11
      5.5       4.8       95.7      100.0          0(  0)         11 
       11
     11         9.1       95.7      100.0          0(  0)         11 
       11
      6         5.5       96.8      100.0          0(  0)         12 
       12
      9         8.0       95.7      100.0          0(  0)        123 
      123
     12        10.6       95.7      100.0          0(  0)         11 
       11
     18        15.5       95.7      100.0          0(  0)         11 
       11
     24        20.3       95.7      100.0          0(  0)         11 
       11
     36        29.1       95.7      100.0          0(  0)         11 
       11
  t  48        37.4       95.7      100.0          0(  0)         11 
       11
T P 54        43.3       99.9      100.0          1(  1)      88674 
   88761

Total packet count::    ideal 8560      lookaround 450

netperf -t TCP_STREAM -H server
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to server (...) 
port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

  87380  16384  16384    11.15       6.01


Is there a chance to repair this bad throughput?


Kind regards,
Andreas




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Re: rt61pci - bad performance, Andreas, (Thu Aug 26, 10:36 am)