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AMD Threadripper 3990x Issues

23d1

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23d1 Member

23d1

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Strange. I wonder if it's due to KVM being on a fully threaded 64 core as opposed to single threaded, and Linux is more efficient in terms of offloading to more threads in the background so to speak. I currently get about 20-30% loss of performance in Cinebench R23.

On 10/12/2021 at 12:58 AM, fabiosun said:

KVM should be a bit less fast than Bare Metal or, in an ideal condition, kvm has similar values

 

 

 

Bare metal; around 43000 points

KVM; around 53000 points

Windows; around 63000 points

 

Edit;

It does seem as though the CPU isn't using any boost or power management, it just sits at 2.9GHz and the fans don't even spin up when under load.

I wonder if this is somehow due to not running at 128 threads, though probably not. I am loading AMDRyzenCPUPowerManagement.kext and SMCAMDProcessor.kext with AMD Power Gadget app... Frequency just stays at 2.9GHz...

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tomnic Senior Member

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4 hours ago, 23d1 said:

Strange. I wonder if it's due to KVM being on a fully threaded 64 core as opposed to single threaded, and Linux is more efficient in terms of offloading to more threads in the background so to speak. I currently get about 20-30% loss of performance in Cinebench R23.

 

Bare metal; around 43000 points

KVM; around 53000 points

Windows; around 63000 points

 

Edit;

It does seem as though the CPU isn't using any boost or power management, it just sits at 2.9GHz and the fans don't even spin up when under load.

I wonder if this is somehow due to not running at 128 threads, though probably not. I am loading AMDRyzenCPUPowerManagement.kext and SMCAMDProcessor.kext with AMD Power Gadget app... Frequency just stays at 2.9GHz...

 

Probably you're not boosting with PBO... try to set it to enabled in bios if it is on auto.

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fabiosun Senior Member

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64 cores is better than 32 c+32 threads

cant you use also in bare metal 64 cores option without hyper thread?

in cinebench 23 my best result is about 47000 with PBO enabled

you will see also a wattage increase if PBO is enabled ( not auto, not disabled)

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9 hours ago, tomnic said:

 

Probably you're not boosting with PBO... try to set it to enabled in bios if it is on auto.

Yes, I tried PBO, but it's the same difference in percentage, basically. So there's quite a loss of performance in bare metal compared to VM. At least 10-15%. And 30% compared to Win/Linux...

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fabiosun Senior Member

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@23d1you know , I loved Proxmox way 🙂

but results in optimal situation was very similar and a bit lower than bare metal for all of us

 

The advantages of proxmox were others, greater compatibility with Adobe apps ... but today I don't see valid reasons to still use that kind of virtualization (albeit advanced and fantastic) 

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39 minutes ago, fabiosun said:

@23d1you know , I loved Proxmox way 🙂

but results in optimal situation was very similar and a bit lower than bare metal for all of us

 

The advantages of proxmox were others, greater compatibility with Adobe apps ... but today I don't see valid reasons to still use that kind of virtualization (albeit advanced and fantastic) 

I hear ya. I would probably be running KVM if I could get past the pci message in kernel, just stops there when passing through the 6800XT, just before booting into the UI. Bare metal seems to work pretty good in general.

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2 minutes ago, fabiosun said:

Could you post a screen grab of your PBO bios settings?

thank you 

I actually set it to the default Auto (Off), as my temps were getting crazy. It did increase the speed in general (with the same percentages of performance loss on bare metal, 30% and KVM, 15%). I had it set to the mid level (3), which was the default for enabled.

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9 hours ago, fabiosun said:

To have PBO enabled you must have a proper cpu cooling system

but to prove a thing you can try this:

put it enable in bios

boot osx

open AMD power gadget tools

run cinebench cpu benchmark one time (off multiple tests)

check tdp with amd power gadget max tdp value i mean

You will be astonished 

check the same with auto or disabled for PBO option

in poor cpu cooler condition PBO in auto or disabled produce pretty same tdp value

as side note

a huge tdp value produces tremendous temperatures and a tiny improvement in benchmark

 

Yeah, on the Noctua right now after discovering it worked better than the AIO I had originally, but getting an Icegiant Prosiphon Elite tomorrow (hadn't realized it was released and a lot smaller than the prototype). In any case, I doubt it'll do anything for my current predicament with performance. Still getting 2.9GHz at a max of 250W even with PBO, so it seems to be an issue with 3990x and power management kexts if nothing else. Basically untapped performance. I don't even know what's possible anymore in terms of masking the CPU as something else, but I assume the only way is through KVM. There should be an increase/boost showing up, but no dice. I think that there is essentially no power management in macOS with 3990x.

Here are a couple of illustrative vids (watching these I realize it's time to swap the monitor);
 

Same results pretty much.

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23d1 Member

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7 hours ago, fabiosun said:

maybe I was not clear

I would like to see this:

757566425_Screenshot2021-10-13at10_36_49.png.723b15bf7791ea99ed76017da86db52a.png

 

during Cinebench test with PBO enabled

 

2065669521_Screenshot2021-10-13at10_38_02.png.a5b46d28af4fb9b23b8b339816287a9d.png

it is a bios problem

AMD app if you do not modify basic feature or option is not responsible of lack of performance

I can capture it, however it stays static at 2.9Ghz/2.9Ghz, only thing that changes is temp (barely) and wattage, but wattage stops at 250W. This is true for both with and without PBO enabled. Not sure what bios setting might help change that, if anything. It seems like a kernel level issue, but I could be wrong of course.

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19 minutes ago, fabiosun said:

@23d1

1-SSDT-PLUG.aml.zip 645 B · 0 downloads

try to declare this SSDT in your ACPI/add section (copy it in ACPI folder)

and see if something happens

Config is fine , i think is a problem related to your bios (version/settings)

In window your CPU scale well (min/max frequency and TDP i mean)

Thanks! Will try it out and report back.

Yes, in Windows and Linux it scales perfectly, and the increase in performance with PBO is insane, but staying stock for now until I swap my Noctua for Icegiant tonight.

 

Edit;

No change.

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39 minutes ago, fabiosun said:

@23d1

no extra idea..it is weird

here is pretty simple

PBO disabled or auto max tdp under 280 w

PBO enabled (smart overclocking and max tdp about 375 watt till temperatures is moderate)

 

we should compare Bios option and behavior with other Asrock creator user like @Driftwood 🙂 )

 

Yes, very very strange, I agree. I can snap some shots of my settings when I get a moment for comparison.

I actually used @Driftwood's EFI shared in this thread as a starting point and built on that with AMDPowerManagement and so forth.

I'm beginning to think more and more that it's a kernel thing that would need to be patched or kexted somehow. It seems that it just defaults to factory safe settings when in macOS, as I'm not even seeing any change in clocks in macOS when having PBO enabled (I thought I did at first, but that was through booting as KVM). Super strange.

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2 minutes ago, fabiosun said:

@23d1have you calculated your exact MMIO whitelist or are you using @driftwood one?

I'm using driftwoods one, which I now realize might be a mistake as I probably have some different settings in general. Do you have a link to info on how to calculate?

 

In any case, I ran some Geekbech 5 benchmarks, and I seem to land at 885 single core and 25326 multi core, which is consistent with other results I see for 3990x ranging from 20k to 32k. So there seems to be a general (pretty large) performance loss with the 3990x on macOS compared to win/linux. Which would point to a need for a kext or something to tap into the full performance...

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Rox67er Senior Member

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On 10/13/2021 at 6:12 PM, 23d1 said:

I can capture it, however it stays static at 2.9Ghz/2.9Ghz, only thing that changes is temp (barely) and wattage, but wattage stops at 250W. This is true for both with and without PBO enabled. Not sure what bios setting might help change that, if anything. It seems like a kernel level issue, but I could be wrong of course.

Do you have DummyPowerManagement enabled? (Should be disabled)

 

592656842_Screenshot2021-10-14at19_48_19.thumb.png.98d5ea97fb776fedf3f8953b6c15a233.png

 

Mine is working just fine (Same motherboard)

1176311072_Screenshot2021-10-14at19_49_13.png.25bd993a05470cdfa97e2a1c87fee826.png

 

While running Cinebench, I do run a low noise profile on my AIO so running a bit hot

1681924758_Screenshot2021-10-14at20_04_22.png.8fb74a0fbeb709e0b9cc974f0d198880.png

Edited by Rox67er
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