[Voyage-linux] Re: [Madwifi-devel] Real throughput tests at 4.4km p2p link

[Wang wenjuan]

Good, and How about your CPU's frequency?
Thanks


2006/4/10, Beat Meier <Beat.Meier at gmx.ch>:
>
> Hello
>
> Testconfig: both sites: SR5 cards, 22dbi grids, madwifi-svn-1457, no wep,
> link distance 4.4km
>
> Below are my test results but first some comments:
>
> It seems that there is a huge difference if you use iperf client on the ap
> site or sta site (see below).
> If iperf client runs on ap and iperf server on sta I get about 28Mbps but
> if
> iperf client
> runs on sta and iperf server on ap I get only about 17Mbps.
> I have only one client on all my tests. Is this limitation in the nature
> of
> an AP or is
> this a limitation of madwifi? This is also if the bitrate is fixed!
>
> For example channel 149 tests, fix rate on both sites:
> 48M: 18.9 Mbps; -67dbm both sites; 20 hour test (iperf client runs on sta)
> 48M: 23.1 Mbps; -67dbm both sites; 2 hour test (iperf client runs on ap)
>
>
> The best channel with SR5 is channel 149, other channels have about -3dbm
> drops in signal with same bitrate fixed!
>
> *********************************************
> Bit Rate  Channel 157
> Mb        Signal Client # Signal Server # Throughput (client on sta)
>
> 54       -70     # -71/-72 # 15 (Throughput client on ap: 24.8Mbps)
> 48       -68/-69 # -70/-71 # 16.5
> 36       -68     # -69     # 15.5
> 24       -67     # -67     # 12.7
> 6        -67     # -66/-67 # 4.03
>
> auto
> 36-54 on ap (iperf server)  # 17.0Mbps
> 48 on sta (iperf client)
>
> 54 on ap (iperf client) # 28.0Mbps
> 36-54 on sta (iperf server)
>
> *********************************************
> Bit Rate  Channel 165
> Mb        Signal Client # Signal Server # Throughput (client on sta)
>
> 54       -69/-70 # -70     # 17
> 48       -68/-69 # -68/-69 # 18.6
> 36       -67/-68 # -67/-68 # 16.3
> 24       -66/-67 # -65/-64 # 12.7
> 6        -66/-67 # -65/-64 # 4.03
>
> auto
> 36-54 on ap (iperf server)  # 18.7Mbps
> 36-48 on sta (iperf client)
>
> or
> 48 on ap (iperf client) # 24.5Mbps
> 54 on sta (iperf server)
> *********************************************
>
> The constelation iperf client on ap is much more "stable"  i.e. bitrat
> does
> not change as much as if client is running on sta!
> But this is not the problem of the lower throughpout because you can fix
> the
> bitrate as noted and there is a hughe difference.
> In the lower bitrates they are almost the same but in the higher there are
> differences!!!
>
> Here one of my lab test:
>
> Lab tests, only 4m, Channel 149
>
> client on AP, server on STA
> 54  23.8    -31
> 48  29.9    -28/-29
> 36  23.5    -27
> 24  16.4    -25/-26
> 18  12.9    -25/-26
> 12  8.5     -25/-26
> 9   6.6     -25/-26
> 6   4.37    -25/-26
>
> client on sta, server on AP
> 54  19.2
> 48  18.3
> 36  16
> 24  12.8
> 18  10.7
> 12  8.0
> 9   6.6
> 6   4.69
>
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--
Regards,
Wang.
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