Hi Larry,
I'm running Mandriva 2010 x86_64 (2.6.31.13) and have a 8187b chipset installed:
0bda:8189 Realtek Semiconductor Corp. RTL8187B Wireless 802.11g 54Mbps Network
Adapter
As many other linux users report, this chipset is supported but offers only
limited performance, especially compared to results when using windows.
Some time ago I connected to a Linksys wrt 54 GL router with Linksys firmware
and recently I installed DD-wrt on that router, but perfomance remaind at the
same (poor) level; meaning there must be something wrong with the rtl8187 linux
modul.
Right now the router is ~10 meters away and iwconfig wlan0 output is
IEEE 802.11bg ESSID:"xxx"
Mode:Managed Frequency:2.412 GHz Access Point: 00:14:BF:4A:ED:F9
Bit Rate=18 Mb/s Tx-Power=27 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx [3]
Power Management:off
Link Quality=70/70 Signal level=-33 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Right after booting, I can reach a wireless download rate of ~ 10mbit/s (I have
10 mbit cable internet). After a while, it seems that the wireless rate drops
to 1 mbit/s although iwconfig wlan0 stills shows a bit rate of 11 or 18 mbit/s.
That means, I get stuck at a download speed of ~ 130 K/s -unless I come closer
to the router, 1 meter ie, then the wireless speed goes up again.
The router status shows
Wireless Packet Info
Received (RX)
45915806 OK, 10 errors
Transmitted (TX)
81142592 OK, 746 errors
If the machine with the 8187b chip is connected, I get a lot of TX errors on
the router.
While linux shows good connection quality, the router indicates a bad signal
quality:
Signal Noise SNR Signal Quality
-74 -94 20 24%
-I installed the latest package from linux wireless, driver loaded but for some
reason it was not able to connect to a wpa2 network (iwconfig wlan0 never shot
enc key), so I uninstalled that again.
-I booted a Mandirva 2010.0 x86 live cd to see if the problem is the same on 32
bit system, and yes, it is.
-I found a 'newer' driver rtl8187B_linux_26.1056.1112.2009.release.tar.gz on
ubuntu forum - compiled, installed but for any reason driver did not load
correctly and something ooopsed (I blacklisted rtl8187 and set r8187 as alias
for wlan0).
Any idea what I could do to get some better performance with the 8187b chipset?
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