Problem with uapsd

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Problem with uapsd

francisco cardenas
Hello;

My name is Francisco Cárdenas, I am a Telecommunication engineer in the Seville University. I am working in a proyect about energy efficiency with Madwifi.

I am working with two cards Dlink G520 with chip atheros AR5001X+. One card is in mode AP and the other is in mode STA.

In Madwifi´s code i can see references to UAPSD. I need this mode to save energy. Therefore, i do this in my console (in STA):

sudo iwpriv ath0 uapsd 1

Then, I run a C program to send packets each 500000 usec. But the packets are not sent. I dont know why. (The packets are sent if uapsd is disabled).

To make sure i puts some printf in the code about uapsd y this is the output:

Apr  2 16:55:28 francisco-P5KR kernel: [  230.108019] WME_UAPSD_AC_CAN_TRIGGER??
Apr  2 16:55:28 francisco-P5KR kernel: [  230.108021]
Apr  2 16:55:28 francisco-P5KR kernel: [  230.108021] ieee80211_pwrsave
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608013]
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608015] ieee80211_hardstart
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608019]
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608019] WME_UAPSD_AC_CAN_TRIGGER??
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608021]
Apr  2 16:55:29 francisco-P5KR kernel: [  231.608022] ieee80211_pwrsave
Apr  2 16:55:30 francisco-P5KR kernel: [  232.608013]
Apr  2 16:55:30 francisco-P5KR kernel: [  232.608016] ieee80211_hardstart

Can anyone help me?

Thank you very much
--
Francisco Cárdenas

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