CentOS

Thank you TrevorH

Thanks @TrevorH

I saw it can reach to 3G when I stress only one or a few cores.

But seems we have to enable Turbo in BIOS, can't be able to echo directly. is it correct?

# echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo
-bash: echo: write error: Operation not permitted

My CPU is Model name: Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz Stepping: 1 CPU MHz: 1200.860 CPU max MHz: 3000.0000 CPU min MHz: 1200.0000 And cpupower info as below # cpupower frequency-info analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to h...

Is there a official announcement about centos7_5/7_6 changing the CPU Mhz and busy_poll ?
Thanks.

We have proxysql process running on servers, and recommended with the network-latency profile,

Ah, seem I find the reason why 3.10.0-862 and 3.10.0-957 quit slower than 3.10.0-693.21.1.el7.x86_64 on my test. It is the case that kernel set my NIC parameter "busy-poll" to OFF Kernel 7_5 7_6: # ethtool -k eno2 | grep "busy-poll" busy-poll: off [fixed] Kernel 7_4: # ethtool -k eno2 | grep "busy-p...

After enabled Turbo mode in BIOS, I just did sysbench test again on the following three of kernels. 3.10.0-693.21.1.el7.x86_64 3.10.0-862.14.4.el7.x86_64 3.10.0-957.1.3.el7.x86_64 Now, the CPU max MHz/cpu feq range on the three kernels are same. Model name: Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz ...

Looks the kernel in centos7_5 and centos7_6 always can limit the CPU max MHz without Turbo mode . And I tested in BIOS, we have to forcely set the Turbo mode enabled. OS/Kernel doesn't seem to be able to adjust intel_pstate as needed. Not quite sure why this happened since centos7_5? But thanks for ...

Thanks Jiehtone.

I tried the kernel 3.10.0-957.1.3.el7.x86_64 and seems same with kernel-3.10.0-862.

Thanks a lot, I'll take a try.
But a bit confused why it is not appeared in kernel 3.10.0-693*, is there any changed on kernel 893 about that I can search on?