@balaton

Yes, because for some reason... I upgraded the Linux Kernel to the latest 6.9.3:

https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.9.3.tar.xz

And then I compiled perf from its sources, like:



Now, I ran perf with --stdio & exported to a file.

It's not so beautified, but quite ok.
And I don't know if it is the whole report (765Kb).

I sent it via email.

@balaton

Ok, I sent it via email.

@balaton

I don't know if I can export



as a file. Also, I cannot upload the original perf.data to file.io probably due to its binary type.


Sending you an image of what I'm seeing.

https://ibb.co/Czt3f7x

I observed a call to the helper_raise_exception_err function, if it means something.

@balaton

Ok, so I ran:



Just before starting the GfxBench2D test.

Then I stopped perf when it reached test 18/54.

And then converted to a readable file. Decompressed file size is 600MB.


https://file.io/fx37WyGXd878

FYI: I had compiled Qemu with --enable-lto.

@balaton

The results while running the command above:

https://file.io/3TvU0POHsIyX

It's again up to test 16/54.

@balaton

Regarding pref profiling, I don't know if you meant something like this:


1) I start Qemu on isolated core 14.



2) I started GfxBench2D on AOS4 guest

3) Started perf mem using:



4) GfxBench2D reaches test 17 of 54. And here I stopped the perf mem process.

5) Converted perf.data to perf.data.txt using:



A small sample of the produced (7mb) file is:



If this is quite the process, here is the full output:

https://file.io/5Algg1ZdFo53

@balaton
Not that I have much experience in Linux profiling, but I will try it.

@joerg
Yes, Apple M2 for example is much faster with Qemu-PegasosII-AOS4.1. There might be PCIe solution for Macs, the eGPU devices. But they are so expensive. Around 800 Euros. I'd rather prefer to get a real PPC machine.

Thanks a lot for the clarifications @balaton & @joerg.

I'm considering buying another GPU if there is one that works with Qemu-Pegasos2. A Radeon HD, maybe?

Except if there is no point in buying any GPU under the current PPC Qemu/VFIO emulation status or potential problems in RadeonRX.chip and RadeonHD.chip.

@balaton

I've also tried the Sam460ex machine on Qemu again with RX 550:




But I get the following error on VGA (the boot process continues, and I see the SM502 display):



On the same configuration,
When I use pcie.0 the gpu is ignored and boots from SM502 display again.

When I use pci.0, I get the following error:



In this case, the boot process halts.

@Hans @joerg

I ran this test too. It took about 3 hours to finish.

----
Operation MiB/s
Copy to VRAM 98.28
Write Pixel Array 101.30
Copy from VRAM 4.29
Read Pixel Array 4.29
----

http://hdrlab.org.nz/benchmark/gfxbench2d/OS/AmigaOS/Result/2784 (Pegasos II/MPC 7447/7457, Radeon RX Polaris12)

@balaton

Hello,

When I remove the bus=pci.0 it gets stuck with:



By using the bus=pci.0, it still shows this message above but it continues and boots.

I have tried with both CSM Disabled/Enabled.
In case of CSM Disabled I've tried both PCI "Legacy Only" and "UEFI Only" modes. The latter was unnecessary to try, I think.

Also, in UEFI, by having the "Resize Bar" setting to "Enabled", the above message is printed again, not once but periodically, every half of a second, and the system does not boot.

I disabled compositing effects on AmigaOS, and any transparency setting I found, but no luck. It is slightly more responsive but not sustainable for someone to use.

I currently do not have a second machine to try the GPU.

FYI: I use the same card with VFIO, virsh, to run a Windows 11 guest, and it works smoothly.

@joerg

Here you go,

https://ibb.co/1bVsZ31

.....
idle. Task 64.1%
compose. Task 10%
page_sweep 2.8%
.....



Also, I have tried both ways. Using pegasos.rom and bboot. Both work, the same slow performance though.

@derfs

Yep, I've done this already...

@walkero

Hi there,

What I am trying to do is a passthrough of my secondary host GPU, a Sapphire RadeonRX 550 on Qemu, PegasosII emulation machine. On this QEMU setup, I installed AmigaOS4.1 FE Pegasos II Edition. Then with great help from @balaton via email, I managed to make a successful VFIO passthrough.

Before that, I had to isolate my RadeonRX GPU on the host system so it only uses the VFIO driver.

I plugged in the secondary card on a second monitor. Using an HDMI-to-HDMI cable. It seems to work because AmigaOS reports that is using the card via the RadeonRX.chip driver. At this moment my problem is that AOS4 is extremely slow. So slow that you have to be very very patient to do the slightest operation, such as double clicking on a Workbench folder... The window appears after 2-3 seconds and I can see it drawing and drawing for another 5-6 seconds.


It is true, that a real PegasosII does not have a PCIe slot. Only PCI. My Radeon GPU is plugged into a PCIe slot because my motherboard is relatively new, so it does not have a PCI slot. I don't know if this contributes to the slow performance.

I don't even know if the problem is on QEMU side or on AmigaOS4 Radeon.chip side. But I guess that the problem may exist in the AmigaOS part.

On the post that you've sent, Zoltan may refer to the conversation we had via email. Not sure.

Hello all,

CC: @Hans @balaton

RadeonRX 550 (my secondary GPU) is recognized by Qemu 9.0.50, PegasosII & AmigaOS4.1 FE Upd 2.
To make RadeonRX 550 work, I had to go to host's BIOS and disable the "Resize BAR" setting.
In AmigaOS4, RadeonRX 550 seems to work, and two new processes appeared: rx_gc, rx_pm.

The problem is that AmigaOS is extremely slow - while without VFIO, using only SM501, it's much much faster.
During the guest BIOS boot I get the message:
System doesn't have full memory coherence. Compensating...

But the lowest CPU consumption is 61%, and this only when it is idle.
When I move the cursor or open a folder, CPU is always 100%.


Some images from Ranger:
https://ibb.co/dpMRtp1
https://ibb.co/wCqnXH2
https://ibb.co/qnhWZ23
https://ibb.co/F8NP25b


Is there a way to fix this performance issue?


Below, you can see the specifications of my systems (host, guest, emulator) and the corresponding configurations.


Host System:
CPU: Intel Raptor Lake-S (Core i5) 13th Gen Intel(R) Core(TM) i5-13400
CPU Instructions: HT, MMX, SSE(1, 2, 3, 3S, 4.1, 4.2), AVX(1, 2), FMA(3), AES, CLMUL, RdRand, SHA, VT-x, x86-64

Motherboard: ASUSTeK COMPUTER INC. PRIME Z790-P D4 Rev 1.xx
BIOS Version: American Megatrends Inc. 1656 04/18/2024

Operating System: Ubuntu 24.04 LTS
Linux Kernel: Linux 6.8.0-31-generic

Graphics Card Driver: vfio-pci
Graphics Card Model: PCIe Sapphire RadeonRX 550 --> Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X]


lspci -nnk Results:



Emulation System & Configuration:
- QEMU emulator version 9.0.50
- Bboot v0.7

Qemu command:


Guest System:
- AmigaOS4.1 FE Update 2
- Enchanched Software v2.2
- RadeonRX.chip v2.12


Kickstart Layout with RadeonRX enabled:




Boot logs with RadeonRX.chip.debug enabled: