Accuracy of rte_get_tsc_hz() compared to linux

[Stephen Hemminger]

On Thu, 19 Sep 2024 01:04:40 +0300
Isaac Boukris <iboukris at gmail.com> wrote:

> I've run the helloworld application on an isolated cpu:
> taskset -c 10 ./dpdk-helloworld --log-level=lib.eal:debug --no-huge
> 
> The results are:
> EAL: TSC frequency arch ~2100000 KHz
> EAL: TSC frequency linux ~2095082 KHz
> EAL: TSC frequency estimate ~2095346 KHz
> 
> The arch one is picked, which seems rather wrong, any way to override that?
> Should we lower the estimation rounding to 1MHz or even 1KHz in the linux one?
> 
> Thoughts? Thanks!
> 
> Kernel: 4.18.0-513.9.1.el8_9.x86_64

Note: 4.18 kernel was end of life 12 August 2018, I assume
this is RHEL8 which does their own backports and never changes kernel version.

What is the kernel dmesg, why is it deciding on that value?