Ryzen unusual load in core0

So no one in this thread has heard of the Ryzen Power Plan, whose purpose was to alleviate the core scheduling issue that Windows has (had) with Ryzen? If you are installing the newer AMD chipset drivers, you should also be getting the Ryzen Balanced power plan.

Yes, I saw this issue early on in my use of my Ryzen system, but that is long gone. If you are using Windows 10, and get continuing updates, the core scheduling issue does not exist, even if you don't use the Ryzen power plan. This issue is not a UEFI/BIOS issue.

If you are using Windows 7, which is not officially supported by Ryzen, then you may still have this issue, unless MSoft has an Ryzen update for Windows 7. I doubt that it does.

Issues with USB devices again are normally related to Windows 7 use, and the fact that only USB 3.0 drivers are used for ALL of the USB ports (2.0 and 3.0) on Ryzen boards, and all Intel boards starting with the 100 series chipsets. Windows 7 does not have a native USB 3.0 driver, so one must be included with Windows 7, or installed after a Win 7 installation, using a PS2 keyboard, with the PS2 emulator option enabled in the UEFI for a USB mouse.

Zaccyi wrote: Hi mxpie, I'm now on BIOS L2.41 now (this was sent to me from ASRock tech support as I emailed them for assistance). After installing this BIOS and installing Windows 10 from scratch again (Creators update) I don't appear to have the issue any longer. I previously updated to BIOS 2.22, which resolved the issue except for when I put the PC to sleep and woke it (which then resulted in the high Core 0 CPU usage). If I plugged in a USB device without sleeping the issue was resolved (although in this case I did not install Windows 10 from scratch, if I did, it could be that this would also have resolved the waking from sleep high Core 0 CPU usage).

Thanks for the update Zaccyi thats good to hear.  I kinda suspected the issue would be resolved eventually with the right BIOS revision.

are you all on BIOS 2.20 now?  I'm still on 1.40 but was planning to update this weekend.  Overall I was mostly waiting for the bigger official update coming next month that is supposed to greatly improve RAM compatibility.  Hoping some other quirks like this might get ironed out with it as well.

My workaround for this stuck high core 0 issue in the mean time has been to just use my external drive dock with a separate USB card. 
like this

It's not 3.0, but the drive I use isn't fast enough to really matter anyway.


Edited by mxpie - 20 Apr 2017 at 1:22am

Yes, I have already installed the AMD all in 1 driver ver16.50.2601 from my motherboards download page (Asrock Fatal1ty AB350 Gaming K4).

I just tried to plug in a Xbox 360 Wireless Gaming Receiver into the USB3 port on the motherboard and the high CPU usage on Core 0 also occurs (varying between 70% - 85%), with the System interrupts on Resource monitor showing it's using 5% of the CPU. So it looks like the issue does not just occur with external drives.