System monitor's connection graph looks more solid in Karmic than in
Jaunty, with smaller gaps. But I am feeling lower transfer rates on
local network. Its only a feeling, I did not measure it before updating,
sorry. Now, for large files, on the same room, I get an average of 2MB/s
receiving and 1MB/s sending. Is it ok?
Some data:
1) indoors, same room, 2 meters away
wlan0 IEEE 802.11bg ESSID:"casinha"
Mode:Managed Frequency:2.462 GHz Access Point: 00:13:46:11:08:68
Bit Rate=36 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption
key:E540-ECB2-633E-4859-B587-BB96-5906-4B30-05B4-0F1C-B3BF-40DA-34B4-67A8-F724-3E17
[2]
Power Management:off
Link Quality=70/70 Signal level=-19 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Bit rate setting is auto, but it does not go 54Mb/s. If I force it I
have connection issues. My signal level deviates between -22 and -17
dBm. No packet loss:
PING roteador.localdomain (192.168.0.1) 56(84) bytes of data.
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=1 ttl=127 time=1.73
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=2 ttl=127 time=2.96
ms
...
^C
--- roteador.localdomain ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9015ms
rtt min/avg/max/mdev = 1.146/1.728/2.968/0.559 ms
2) indoors, 2 walls, 10 meters away (I couldn't connect from this same spot
with Jaunty.)
wlan0 IEEE 802.11bg ESSID:"casinha"
Mode:Managed Frequency:2.462 GHz Access Point: 00:13:46:11:08:68
Bit Rate=18 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption
key:E540-ECB2-633E-4859-B587-BB96-5906-4B30-05B4-0F1C-B3BF-40DA-34B4-67A8-F724-3E17
[2]
Power Management:off
Link Quality=67/70 Signal level=-43 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Bit rate is adapting to signal level, with deviates from -43 to -42 dBm.
But I get packet loss:
PING roteador.localdomain (192.168.0.1) 56(84) bytes of data.
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=1 ttl=127 time=1.53
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=2 ttl=127 time=1.70
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=3 ttl=127 time=1.46
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=5 ttl=127 time=1.58
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=6 ttl=127 time=1.61
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=7 ttl=127 time=2.18
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=8 ttl=127 time=7.75
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=9 ttl=127 time=2.32
ms
64 bytes from roteador.localdomain (192.168.0.1): icmp_seq=10 ttl=127 time=1.53
ms
^C
--- roteador.localdomain ping statistics ---
10 packets transmitted, 9 received, 10% packet loss, time 9017ms
rtt min/avg/max/mdev = 1.461/2.411/7.757/1.912 ms
----
So things are better in Karmic, but not 100% for me, yet.
My router is a DLink DI-524 and my card is ID 0bda:8189 Realtek
Semiconductor Corp. RTL8187B Wireless 802.11g 54Mbps Network Adapter.
Thanks.
--
rtl8187 link quality poor
https://bugs.launchpad.net/bugs/215802
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