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SVM Mode On + HyperV Install => BCLK unstable

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TrakRailySurely View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TrakRailySurely Quote  Post ReplyReply Direct Link To This Post Topic: SVM Mode On + HyperV Install => BCLK unstable
    Posted: 06 May 2018 at 9:34am
Hi.

I installed it because I want to use virtual environment Hyper-V.
I activated CPU SVM in the BIOS.

When SVM was enabled, BCLK was fixed,
Installing Hyper-V will make BCLK unstable.

Is there the same phenomenon?
Why did you fix it?

Help me.

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Windows 10 Pro April 2018 Update (Build 17134.5)
Ryzen 7 1700
X370 Gaming K4

Power Plan : AMD Ryzen Balance Plan

Stable BCLK Clocks -> 99.84
UnStable BCLK Clocks -> 97.86 - 98.47
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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2018 at 10:29am
I have seen that here. As others on the net have too.

It is my understanding that this is a normal occurrence as SVM is completely contained and executed within the processor itself.

I've also personally experienced my OC's be hampered with SVM Enabled, FWIW.
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wardog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2018 at 10:33am
Sorry. Had to grab a backup drive to locate this in-depth link to understand.

https://www.anandtech.com/show/2480/9

hth
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avinicius View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote avinicius Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2018 at 2:46am
Same thing happens with my AB350M Pro4, tested with BIOS 4.70 and 5.00.
AMD Ryzen 5 2400G | ASRock AB350M Pro4 | G.SKILL Ripjaws V @ 3000 MT/s 16-16-16-35 (2x8 GiB) | Seasonic S12II-430
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Post Options Post Options   Thanks (0) Thanks(0)   Quote xhue Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2018 at 2:59am
It's 'normal' or at least - expected. AFAIK SVM and other VM stuff abstracts or hides the real HW and clocks/timers from both host and guest. IDK, might be wrong.

I believe BLCK is actually ticking at a stable rate, it's just a matter of readings and reporting. Or I may be totally wrong.

I'll be dropping a ticket to ASRock. I advise you all to do the same.
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