PHY power saving

matt
 
Posts: 3
Joined: Sun Jul 05, 2015 9:16 pm

PHY power saving

Sun Jul 05, 2015 10:45 pm

Hi

I came across some posts describing PHY power saving techniques and gave it a try. I can confirm that it works and that I get a 76ma power saving and a temperature drop of about 10°C.

Before:
250ma at 3.3v
65°C

After:
174ma at 3.3v
55°C
:D

Code: Select all
#!/bin/sh

echo “Disable unused ethernet ports”

mmio 0x101100c0 0x08002000
mmio 0x101100c0 0x08002001
mmio 0x101100c0 0x08002002
mmio 0x101100c0 0x08002003
mmio 0x101100c0 0x08002004


http://vonger.cn/?topic=power-and-heat
http://www.8devices.com/community/viewtopic.php?f=6&t=156
https://github.com/8devices/mmio

Matt

Vonger
 
Posts: 839
Joined: Sun Oct 19, 2014 6:00 am

Re: PHY power saving

Mon Jul 06, 2015 8:53 am

:) That is a great power saving.

brad
 
Posts: 31
Joined: Tue Jan 06, 2015 5:19 am

Re: PHY power saving

Wed Jul 22, 2015 8:25 am

Thanks for the post. Very helpful! :)

I can confirm, running the CPU at 100% with 5V input (and wifi on) is about 180mA. Turn off the ethernet and it drops to 125mA. That was 55mA saving. Pretty good, and although I still use the 2 ethernet ports, turning off the other 3 saves a little over 30mA. I haven't checked the temp, but I'm not too worried about temperature.

So happy you posted this, Matt!

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