On Sun, Dec 04, 2005 at 05:37:05PM +1100, Con Kolivas wrote:
> Here is an updated complete patch implementing no idle hz ticks
> aka dynticks for i386.
A few stats about running dynticks on my notebook (1.4G Pentium M)
CPU frequency C4 dyntick avg. battery rate[*]
------------------------------------------------------------
0.6 GHz on off 990 mA
0.6 GHz on on 973 mA (-2%)
1.4 GHz on off 1400 mA fan starts very soon (~15sec)
1.4 GHz on on 1100 mA (-21%) fan starts after ~5min
0.6 GHz off off 1130 mA
0.6 GHz off on 1050 mA (-7%)
1.4 GHz off off 1480 mA
1.4 GHz off on 1180 mA (-20%)
[*] as reported by cat /proc/acpi/battery/BAT1/state .
Power consumption during normal operation (C0) and in processor idle states,
as per datasheet:
speed C0 C1 C2 C3 C4
-----------------------------------------------------
1.4GHz 22W 7.3W 7.3W 5.1W 0.55W
0.6GHz 6W 1.8W 1.8W 1.1W 0.55W
=> Most useful when CPU frequency scaling isn't available (Celerons? Do they
have "Deeper Sleep State" -- no, they don't. That's why I did the
test run with C4 disabled. The values for 1.4G without C4 should be
similar to what can be seen on Celerons.)
=> Only minimal additional power savings when CPU frequency scaling works
well
=> Possible reason: entering power states takes more time when at higher
speed
Dominik
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