# \[kernel\] Could I change default clocks?

**URL:** <https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526>\
**Category:** Jetson Nano\
**Created:** [June 17, 2019, 7:37am UTC](https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526 "2019-06-17T07:37:12Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![lonesomesnow](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/lonesomesnow/32/11590_2.png) [@lonesomesnow](https://forums.developer.nvidia.com/u/lonesomesnow)\
**Post date:** [June 17, 2019, 7:37am UTC](https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526/1 "2019-06-17T07:37:12Z")

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I have known I can change clocks by using sysfs, and I can adjust performance by jetson\_clocks and nvpmodel.  
Could I change default clocks (CPU, GPU, peripherals) in dts/dtsi?  
How?  
Thanks!

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**Author:** ![ShaneCCC](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/shaneccc/32/14043_2.png) [@ShaneCCC](https://forums.developer.nvidia.com/u/ShaneCCC)\
**Post date:** [June 18, 2019, 4:27am UTC](https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526/2 "2019-06-18T04:27:33Z")

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Why do you need to change it.

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**Author:** ![agruet](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@agruet](https://forums.developer.nvidia.com/u/agruet)\
**Post date:** [December 21, 2019, 10:47am UTC](https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526/3 "2019-12-21T10:47:09Z")

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Hello ShaneCCC,  
Certainly to avoid doing it during boot time via /etc/rc.local or a custom systemctl. In my case, our application require max-power due to our requirements. I raised a similar question a couple of months ago w/o answers :

[https://devtalk.nvidia.com/default/topic/1056714/max-cpu-gpu-frequency-at-boot/?offset=2](https://devtalk.nvidia.com/default/topic/1056714/max-cpu-gpu-frequency-at-boot/?offset=2) without answers.

Can You pls tell us how to do that.

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**Author:** ![ShaneCCC](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/shaneccc/32/14043_2.png) [@ShaneCCC](https://forums.developer.nvidia.com/u/ShaneCCC)\
**Post date:** [December 23, 2019, 5:34am UTC](https://forums.developer.nvidia.com/t/kernel-could-i-change-default-clocks/76526/4 "2019-12-23T05:34:24Z")

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You may have a modify the file /etc/systemd/nv.sh to try.