cpu frequency problem
soulblade at ntlworld.com
Sat May 24 18:39:03 UTC 2008
> Victor Sterpu wrote:
>> I use Ubuntu 8
>> I have a acer travelmate 5720 dual core 2.2Gh Intel.
>> When I do cat /proc/cpuinfo I se this:
>> model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
>> stepping : 11
>> cpu MHz : 800.000
>> I did a test with lmbench and the cpu frequency is reported as
>> [MHZ: 2378 MHz, 0.4205 nanosec clock]
>> What is the correct frequency?
>> Why this 2 values do not fit?
>> Thank you.
> When I do cat /proc/cpuinfo the following is displayed.
> model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
> stepping : 11
> cpu MHz : 1600.000
> This is because 2400Mhz is load speed and 1600Mhz is idle to save power
> and reduce heat. You can turn off this feature in a lot of motherboards,
> but there is no benefit from doing so.
I would like to retract my last comment. It would seem that some
applications are slowed down by this power saving feature in 8.04
When BOINC is running on all 4 cores the system still runs at 1.6 GHz
instead of 2.4 Ghz. I think it is being cautious for Laptops to stop the
possibility of over heating.
So your laptop is running at 800Mhz to save power and reduce heat. When
you run a normal program or game your cpu should jump to its top rated
speed of ~2.2GHz. If you are running BOINC and your laptop is otherwise
idle then if its behaving the same as my desktop PC it will run at 800MHz.
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