On Thu, 2021-12-23 at 14:02 +0000, Ajay.Kathat@xxxxxxxxxxxxx wrote: > > I verified with wpa_supplicant and it seems the power save mode is > working fine. Tested multiple times with wpa_supplicant running. I > didn't observe any issue in entering or exiting the power-save mode with > wpa_supplicant. > > Try to verify without wpa_supplicant in your setup to observe if we are > seeing this same results in that case. It doesn't help me if it works without wpa_supplicant. I need a reliable way to have power-savings mode in effect when using wpa_supplicant. > With wpa_supplicant, the current consumption is less when PS mode is > enabled but it would be more compared to without wpa_supplicant. That's not what I'm talking about though. The problem is that it seems to be rather erratic whether issuing the iw power_save command makes a difference in power-consumption. I fixed my setup so I can directly measure power consumed rather than just current (power factor matters). Again, this is for the entire device (not just WILC1000). What I find that when power-saving mode is working as expected, the device uses an average of 1.1W. When power-saving mode is not working, power consumption is about 1.4W, or about 300mW higher. I tried again *without* the patch applied and, as expected, the patch doesn't really affect this behavior. After playing with this for a while, I think I found two sequences that reliably reproduce the difference. First, on a freshly booted system and with wilc1000-spi autoloaded by the kernel, try this sequence (copy & paste the commands): /usr/sbin/wpa_supplicant -Bs -iwlan0 -c/etc/wpa_supplicant.conf sleep 10 iw dev wlan0 set power_save on The above yields a power consumption of 1.4W reliably. The "sleep 10" doesn't matter here; the behavior is the same with or without it. I tried waiting up to 120 seconds with no difference. Second, on a freshly booted system and with wilc1000-spi autoloaded by the kernel, try this sequence (copy & paste the commands): /usr/sbin/wpa_supplicant -Bs -iwlan0 -c/etc/wpa_supplicant.conf sleep 10 rmmod wilc1000-spi modprobe wilc1000-spi sleep 10 iw dev wlan0 set power_save on The above yields a power consumption of 1.1W reliably. Can you reproduce this, or, if not, share the power consumption you see for the two cases? --david
