On 09.04.2011 17:39, Bartosz Fabianowski wrote:
I just noticed this thread a day after my own fight with powerd and load
percentages that did not seem to make any sense.
The patch I came up with is attached. It modifies powerd to use the load
percentage of the busiest core. This reduces the range of values back to
0%...100% also for multi-core systems.
While using maximum of loads can be better then using levels above 100%,
it won't properly handle cases of dependent or frequently migrating
threads, that are handled now with summary load and levels less then
100%. While existing powerd algorithm is indeed not perfect, it is the
only relatively performance-safe, unlike others propositions.
I won't argue about adding more algorithms/options to powerd, optimized
for handling different situations, but I believe that default should
remain safe.
On my Core i7 setup here, the change seems to work well.
... in your specific workload. And you haven't described how you
measured system performance to prove that it haven't decreased.
--
Alexander Motin
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