I recently noticed that Unraid will not boost my cpu beyond 3ghz regardless of how many cores/threads have high utilization. Anybody else notice this or have it happen to them and found a fix?

 

Note:

Currently using Unraid 6.4 rc14, although I noticed it on rc9f as well.

Edited December 3, 20178 yr by Malfurious

Hi,

 

I'm actually experiencing this same behavior on my 1700 CPU with unRAID 6.5.0rc-5.

 

I've tried overclocking my CPU to a fixed 3.6ghz as well and can confirm it reflects that in unRAID system info from portal:

 

`CPU: AMD Ryzen 7 1700 Eight-Core @ 3600`

 

However the same behavior persists:

 

My Windows 10 Creators Edition VM reports `Ryzen 7 1700 Eight-Core @ 2.99ghz` and using prime95 testing I can push all cores to 100% without seeing any boost in clock speed.

 

Some perhaps unnecessary info on my setup is: 
 - Last 4 cores are isolated from unRAID and are assigned to Windows VM only.

 - arch='x86_64' machine='pc-i440fx-2.10'

 - Kernel: Linux 4.14.24-unRAID x86_64

 

I'm curious if any of this info matches yours, or if you perhaps have found any next steps / resolution elsewhere?

 

Thanks all!

My understanding is that 'turbo boost' only works for 1 core during times when the other cores are idle, and in addition, requires C6 states to be enabled.  This was one of the things you had to give up with Ryzen in order to have a stable system.  Disclaimer: I haven't looked into this in several months so the situation could be different now.

Yeah I have a R5 1600x and I just oc my processor to 3.8 to get what I need out of it.

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5 hours ago, limetech said:

My understanding is that 'turbo boost' only works for 1 core during times when the other cores are idle, and in addition, requires C6 states to be enabled.  This was one of the things you had to give up with Ryzen in order to have a stable system.  Disclaimer: I haven't looked into this in several months so the situation could be different now.

 

 

Aha! Thank you for your reply.

 

I do have C states disabled it seems. Although I would prefer stability to the extra speed if that is the case. 

 

I'll have to follow up with ryzen stability changes in the future. 

Look out for a BIOS update that supports Power Supply Idle Control (ASRock and Gigabyte are offering it now, I believe). It may just be another name for C6-disable, as some have speculated, or it might be a different approach to the problem.

So I went in and enabled c-states in my bios.

 

No settings I messed with changed how Windows 10 VM reported CPU speed @ 2.99ghz.

 

I did however run a nova bench test with the cpu set to auto and then manually overclocked in bios. 

 

The stock tests were in the low 1800s and overclocked tests were in the high 2100s. This was due to the core clock speed being a bottleneck for the GPU as well. 

 

It does show though that the reported clock speed in VM isn't reflective of actual performance. 

 

 

I'll leave c-states enabled for now unless stability becomes a concern, and then I'll disable them and do another benchmark.

 

Thanks all!