Messages in this thread | | | From | David Laight <> | Subject | Running an Ivy Bridge cpu at fixed frequency | Date | Wed, 4 Dec 2019 17:01:32 +0000 |
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Is there any way to persuade the intel_pstate driver to make an Ivy bridge (i7-3770) cpu run at a fixed frequency? It is really difficult to compare code execution times when the cpu clock speed keeps changing. I thought I'd managed by setting the 'scaling_max_freq' to 1.7GHz, but even that doesn't seem to be working now. It would also be nice to run a little faster than that - but without it 'randomly' going to 'turbo' frequencies (which it is doing even after I've set no_turbo to 1).
An alternative would be a variable frequency TSC - might give more consistent values.
David
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