Sergey,
I took down the server at the weekend to install a newly built kernel and insert the power monitor.
47W - All services running at idle, tuner power saving disabled 44W - All services running at idle, tuner power saving enabled
As tuners are powered down most of the time, that's a handy 6% average saving.
The hardware is an HP 8300CMT with high efficiency PSU, G2130 Ivy bridge CPU and a 3 x 2T RAID + KMC4400R for CCTV video capture, the tuners are PCTV Nanostick 290e for HD/SD (USB2) and an old Leadtek DTV1000 T (PCI) for SD - both of which are super-reliable BTW.
Obviously other tuners will vary, and if the PSU isn't the efficient 90% one like this, the savings will be marginally more.
Richard
On 2/06/2016 17:15, glenvt18 wrote:
As the server also runs the home automation/lights/heating/security, CCTV, mail server, and file storage/Owncloud ...
That's the main purpose of this feature. You don't have to switch off your tuners physically, close your connections or put your server into sleep (and ARM devices usually don't have a sleep mode at all). You can stream your recordings, watch movies and do other stuff with your server and, at the same time, keep your tuners cold.
OK, I'll keep an eye on it. No adverse effects yet - good work, thanks.
I've modified the monitor script: http://pastebin.com/DR4gUdZR
Now it prints timestamps and it's output can be searched and grep-ed. Run it with '|tee' for several days.
Best, Sergey Chernyavskiy.