On Mon, 21 Jul 2008, Kalle Valo wrote: >> I recently noticed that my tablet battery runs down faster at work than >> at home, with the WiFi enabled but otherwise sitting idle (12%/hour vs >> 1%/hour). > > What do you mean by 12%/hour? That the battery will run out in eight > hours? I guess. I was using the "battery-status" application which reports percentage of battery left, and measuring the slope. > Yes, multicast and broadcast traffic will increase WLAN power > consumption. But there has to be a lot of traffic going on to really > notice it. I tried doing a broadcast ping every 200ms at home (the tablet sees it if I run tcpdump) but it had no noticable effect on the battery consumption graph. > If the AP is behaving correctly, the power consumption in PSM on a > idle N800/N810 are mostly affected by these: > > o beacon interval (longer has smaller power consumption) > o DTIM interval (same as above) > o broadcast/multicast traffic I'll have a look at the AP config tomorrow and see if I can find anything. My linksys at home has beacon interval 100ms, DTIM=1 (i.e. default values). The Linksys docs suggest that DTIM data is only sent if there are broadcast packets waiting, so perhaps setting this larger would have little effect if I don't have much broadcast traffic. Besides, the problem is at work, not home. -- Andrew Daviel, TRIUMF, Canada _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
