On 23/12/21 22:38, David Mosberger-Tang wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > 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. Okay. In my setup, I observed that PS mode works with and without wpa_supplicant. Now tested by following your command sequence. >> 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. I have tested by making the WILC as build-in module to insert driver automatically at boot-up. I hope it should be fine. Because I have already tested as loadable module earlier. Below are the number observed ------------------------------ -------------------------- - before starting wpa_supplicant : ~16.3 mA - wpa_supplicant started : ~40 mA - PSM on : ~6 mA The 'sleep 10' would have no impact in my setup because I have measured the current consumption for wilc1000 chip. I have shared the screenshot at https://postimg.cc/67S41dkb > 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? Second case was verified earlier and also tested by toggle power_save mode on/off many times and I observe the numbers are in same range for both cases. Regards, Ajay
