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Server halts after a while with C States enabled. (Intel)

sir_ferguson
in General Support

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Hi everyone, I recently tried to optimize my server for power efficiency. Powertop had 0% on for all package c states. After playing around with BIOS settings for a while I figured out that everything seemingly works if i set "C State Limit" to the highest stated ("C7" for me) instead of "Auto". After that, power top displays percentages for all package c states and I save around 4w at idle.

 

The problem is, after a while the server just halts. No Web Interface. No SSH. Not even when directly connected to the server. After this I have to manually reset.

 

I know Ryzen CPUs have issues with C States on Linux. However my server is running on an Intel i5 4670. Any ideas? For me the problem has been hard to diagnose since the it only occurs after the server has been running for a while.

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