The hint can be changed by writing to this attribute. Maximum P-state the driver is allowed to set in percent of the maximum supported performance level the highest supported turbo P-state. The one-core maximum turbo P-state is thus the maximum supported one overall. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. C0 is the operating state. Thanks for that Doug. There are a host of other factors influencing runtime, such as cache size and speed, interrupts, etc.

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The coordination between those limits is based on the following rules, regardless of the current operation mode of the driver:. Note, however, that achieving desirable results this way generally requires intdl understanding of the power vs performance tradeoff, so extra care is recommended when attempting to do that. Sign up or log in Sign up using Google.

Share Tweet Share Send. All I can suggest, is that you try it. When someone refers to a P-state, generally only the frequency is talked about. Moreover, confusingly enough, they generally do not work in the same way as the generic governors they share the names with. Doug Smythies 7, 3 14 The reasons why you want to reduce the peak thermal load is pretty obvious. intfl


What exactly is a P-state? (Pt. 1)

So what is the advantage of reducing the speed and consuming more power? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The same applies for decreasing the frequency.

Additional states are defined by manufacturers for some processors. Although it often is possible to obtain all of it from the processor itself using model-specific registersthere are cases in which hardware manuals need intl be consulted to get to it too.

Moreover, some processors support the Configurable TDP Thermal Design Power feature and, when that feature is enabled, the turbo threshold effectively pstatf a configurable value that can be set by the platform firmware. The governor “performance” may decide which speed to use within this range. This attribute is read-only.

One important property of turbo P-states is that they are not sustainable. C0 is the operating state. I am searching on power consumption on each power state for intel core i7 or i5 or i3. It’s running all that time anyway. If unset equalt to 0, which is the defaultinteel P-states can be set by the driver. Without HWP, this P-state selection algorithm is always the same regardless of the processor model and platform configuration.

What those hints are depends on which P-state selection algorithm has been applied to the given policy or to the CPU it corresponds to. We all know pstaate increasing the frequency, increases a processor’s performance. Sign up using Email and Password. For example, Intel ‘s Haswell platform has states up to C10, where it distinguishes core states and package states. I’m neglecting the effect of thermal ptsate. Email Required, but never shown.


Documentation/cpu-freq/ – kernel/common – Git at Google

In fact, if one of them is set by software, the processor is not expected to change it to a lower one unless in a thermal stress or a power kntel violation situation a higher P-state may still be used if it is set for another CPU in the same package at the same time, for example.

Sign up using Email and Password. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that pstatw have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The global and per-policy limits can be set independently. Operation mode of the driver: The effectiveness of your cooling is based upon peak power, not average power. Namely, if that option is set, the performance algorithm ptsate be used by default, and the other one will be used by default if it is not set.