Re: [Ipw2100-devel] problem in battery mode

[Alex T. <bz...@ge...>]

On Sun, 29 Jan 2006 20:40:32 -0600
"Bonilla, Alejandro" <ale...@hp...> wrote:

>     Could you please elaborate?

sure.

in AC mode:

[root@bzzz ~]# iwconfig eth1
eth1      IEEE 802.11g  ESSID:"XXXX"  Nickname:"XXXXXXXXXXXXX"
          Mode:Managed  Frequency:2.447 GHz  Access Point: 00:11:6B:21:FC:A4   
          Bit Rate=54 Mb/s   Tx-Power=20 dBm   
          Retry limit:7   RTS thr:off   Fragment thr:off
          Encryption key:XXXX-XXXX-XX   Security mode:open
          Power Management:off
          Link Quality=77/100  Signal level=-52 dBm  Noise level=-88 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[root@bzzz ~]# iwpriv eth1 get_power
eth1      get_power:Power save level: 6 (AC) OFF


now I do:

[root@bzzz ~]# iwpriv eth1 set_power 7
[root@bzzz ~]# iwpriv eth1 get_power
eth1      get_power:Power save level: 7 (BATTERY)

sometimes in few minutes, sometimes in dozens random tcp connections get frozen.
interesting point is that all the connections are to the same host, but
only some of them are stuck. from my side things look OK, nothing interesting
in dmesg (no firmware restarts), but on the remote side i see this:

[root@gw ~]# netstat -tn|grep :22
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
tcp        0  13344 ::ffff:80.71.248.82:22      ::ffff:192.168.200.17:60995 ESTABLISHED

so, it looks like the remote host gw just can't send packets back.

[root@bzzz ~]# iwconfig eth1
eth1      IEEE 802.11g  ESSID:"XXXX"  Nickname:"XXXXXXXXXXXXX"
          Mode:Managed  Frequency:2.447 GHz  Access Point: 00:11:6B:21:FC:A4   
          Bit Rate=54 Mb/s   Tx-Power=20 dBm   
          Retry limit:7   RTS thr:off   Fragment thr:off
          Encryption key:XXXX-XXXX-XX   Security mode:open
          Power Management:on
          Link Quality=78/100  Signal level=-51 dBm  Noise level=-83 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
[root@bzzz ~]# iwpriv eth1 get_power
eth1      get_power:Power save level: 7 (BATTERY)

usually, it takes few minutes for connections to get back from stuck.
to make the picture clear: 

[bzzz] -- wifi --> [access point] -- ethernet --> [gw]


thanks, Alex


> Do you get more firmware restarts?
> Do you manually do the iwpriv command or you have an script that does it?
> Do you see more lost packets while on batter? iwconfig should tell you.
> 
> We haven't really seen anything related to battery problems with only 
> download problems. (fw restarts)
> 
> .Alejandro