Here are some figures (I used your pmstats):

The machine is a Pentium M 2.00 GHz, supporting C0-C4 processor power states.
The machine run at 2.00 GHz all the time.
A lot of modules (pcmcia, usb, ...) where loaded, services that could
produce load where stopped -> processor is mostly idle.

_____________________________________________________________________________________
*Running with 1000Hz:*

_No processor module:_

Average current the last 100 seconds: *2289mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/1000_HZ_No_module_loaded)


_passing bm_history=0xFFFFFFFF (default) to processor module:_

Average current the last 470 seconds: *1986mA* (also measured better values ~1800, does battery level play a role?!?)
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/1000_HZ_bm_history_FFFFFFFF)


_passing bm_history=0xFF to processor module:_

Average current the last 190 seconds: *1757mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/1000_HZ_bm_history_FF)
(Usage count could be bogus, as some invokations could not succeed if bm has currently been active).
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*Running with CONFIG_NO_IDLE_HZ:*
Patched with http://www.muru.com/linux/dyntick/patches/patch-dynamic-tick-2.6.12-rc2-050408-1.gz
(With the c-state patch attached applied)

_No processor module:_

Average current the last 80 seconds: *2262mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/tony_dyn_tick_No_module_loaded)

idle_ms == 40, bm_promote_bs == 30
Average current the last 160 seconds: *1507mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/tony_dyn_tick_processor_idle_40_bm_30)

idle_ms == 100, bm_promote_bs == 30
Average current the last 80 seconds: *1466mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/tony_dyn_tick_processor_idle_100_bm_30)

idle_ms == 40, bm_promote_bs == 50
Average current the last 150 seconds: *1481mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/tony_dyn_tick_processor_idle_40_bm_30)

idle_ms == 40, bm_promote_bs == 10
Average current the last 330 seconds: *1474mA*
(cmp. ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/measures_C4_machine/tony_dyn_tick_processor_idle_40_bm_10)

Hmm, parameters do not influence at all ... (idle_ms should only comes in when switching between idle/not idle).
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The measures are based on the /proc/acpi/battery/*/* info and are not very accurate, but could give an overall picture.

      Thomas

P.S.: Not tested, because I have no x86_64 C3 machine, but the patch should also work reliable with Andi's dyn_tick patch
for x86_64 machines.

Tony: I modified your pmstats to produce an average current value: ftp://ftp.suse.com/pub/people/trenn/dyn_tick_c_states/pmstats