2014-08-21 23:32 GMT+02:00 Axel Dörfler <axeld@xxxxxxxxxxxxxxxx>: > A switch to Linux would give us plenty of interesting features. Proper power > management is only one of them, although I don't really think it would be > all that hard to achieve for most hardware (on my Haswell based NAS, Haiku, > booted from USB, only needs 1W more than Ubuntu 14.04 when idling, thanks to > Pawel). I think I can help you lower that :) In the cpu-idle GSoC the reason found that we don't save more power is the ticking of network at 1000Hz and Deskbar/Tracker doing some querying. Both of these wake the cpu much more than needed and can 'easily' be improved. The tick for networking is just to check if there is a cable connected, rate control and other side tasks, and could probably be lowered a lot. (FreeBSD Arm uses 100Hz, but I think 20 or 10 would be ok, atm we use same as FreeBSD x86). The other case I don't have inside details on, but I was told it was doing old style querying instead that could be replaced. /Fredrik Holmqvist, TQH