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Factors influencing IOMMU groups

HumanTechDesign
in VM Engine (KVM)

Featured Replies

Hey there,

new Unraid user here. I'm currently in the process to plan out the further VM use of my server, I had a look at the IOMMU groups of my board.

It's a ASrock B550M Steel Legend (BIOS P2.30 (February 2022)) with a Ryzen 5 Pro 4650G (Renoir).

When researching the board's capabilities, I stumbled upon this post (referencing this pastebin with IOMMU groups of this board).

Unfortunately, I don't know, which BIOS this is on, but generally, the groups seem quite well separated:

  

IOMMU Group 0:
        00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
        00:01.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge [1022:1483]
        01:00.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ee]
        01:00.1 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] Device [1022:43eb]
        01:00.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43e9]
        02:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
        02:06.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
        02:07.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
        02:08.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
        02:09.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea]
        03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] [1002:67ff] (rev ff)
        03:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X] [1002:aae0]
        06:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125] (rev 05)
        07:00.0 Network controller [0280]: Intel Corporation Wi-Fi 6 AX200 [8086:2723] (rev 1a)
IOMMU Group 1:
        00:02.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 10:
        00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 0 [1022:1440]
        00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 1 [1022:1441]
        00:18.2 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 2 [1022:1442]
        00:18.3 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 3 [1022:1443]
        00:18.4 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 4 [1022:1444]
        00:18.5 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 5 [1022:1445]
        00:18.6 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 6 [1022:1446]
        00:18.7 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 7 [1022:1447]
IOMMU Group 11:
        09:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function [1022:148a]
IOMMU Group 12:
        0a:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Reserved SPP [1022:1485]
IOMMU Group 13:
        0a:00.1 Encryption controller [1080]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Cryptographic Coprocessor PSPCPP [1022:1486]
IOMMU Group 14:
        0a:00.3 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Matisse USB 3.0 Host Controller [1022:149c]
IOMMU Group 15:
        0a:00.4 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller [1022:1487]
IOMMU Group 2:
        00:03.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
        00:03.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge [1022:1483]
        08:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev e7)
        08:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] [1002:aaf0]
IOMMU Group 3:
        00:04.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 4:
        00:05.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 5:
        00:07.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 6:
        00:07.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1022:1484]
IOMMU Group 7:
        00:08.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge [1022:1482]
IOMMU Group 8:
        00:08.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B] [1022:1484]
IOMMU Group 9:
        00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller [1022:790b] (rev 61)
        00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge [1022:790e] (rev 51)

 

I now have my board here and in the process of preparing it, I updated the BIOS to Version P2.30 (February 2022). I forgot to have a look at the IOMMU groups before flashing, but right now, Unraid lists the following devices for me (which looks way worse to me):

  

IOMMU group 0:	[1022:1632] 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
IOMMU group 1:	[1022:1632] 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
				[1022:1634] 00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
				[1022:1634] 00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
			 	[1022:43ee] 01:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43ee
				Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
				Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
				Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
				Bus 001 Device 004: ID 26ce:01a2 ASRock LED Controller
				Bus 001 Device 005: ID 0781:556b SanDisk Corp. Cruzer Edge
				Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
			 	[1022:43eb] 01:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43eb
				[1:0:0:0]    disk    ATA      Samsung SSD 870  1B6Q  /dev/sdb    500GB
				[2:0:0:0]    disk    ATA      Samsung SSD 870  1B6Q  /dev/sdc    500GB
				[3:0:0:0]    disk    ATA      ST18000NM000J-2T SN02  /dev/sdd   18.0TB
				[4:0:0:0]    disk    ATA      ST18000NM000J-2T SN02  /dev/sde   18.0TB
				[1022:43e9] 01:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43e9
				[1022:43ea] 02:08.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43ea
			 	[10ec:8125] 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
			 	[144d:a808] 04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
				[N:0:4:1]    disk    Samsung SSD 970 EVO Plus 1TB__1            /dev/nvme0n1  1.00TB
IOMMU group 2:	[1022:1632] 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
				[1022:1635] 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus
			 	[1002:1636] 05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev d9)
			 	[1002:1637] 05:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
			 	[1022:15df] 05:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
			 	[1022:1639] 05:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
				Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
				Bus 003 Device 002: ID 174c:2074 ASMedia Technology Inc. ASM1074 High-Speed hub
				Bus 003 Device 003: ID 0463:ffff MGE UPS Systems UPS
				Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
				Bus 004 Device 002: ID 174c:3074 ASMedia Technology Inc. ASM1074 SuperSpeed hub
			 	[1022:1639] 05:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
				Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
				Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
				Bus 006 Device 002: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
			 	[1022:15e3] 05:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller
IOMMU group 3:	[1022:790b] 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
			 	[1022:790e] 00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
IOMMU group 4:	[1022:1448] 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 0
				[1022:1449] 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 1
				[1022:144a] 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 2
				[1022:144b] 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 3
				[1022:144c] 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 4
				[1022:144d] 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 5
				[1022:144e] 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 6
				[1022:144f] 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 7

 

I currently have no dGPU installed, but I was thinking about passing trough the front USB IO Hub (and possibly other stuff).

I am of course aware of the possibilities to break up the groups via the different methods (the classic https://www.youtube.com/watch?v=qQiMMeVNw-o), but I'm just a little surprised to see such strong differences in grouping.

 

As I'm rather new to the topic, I was wondering, which factors actually influence the groupings. CPU? Kernel? Or basically only Chipset and corresponding BIOS?

Would you expect the BIOS update (as I said, unfortunately, I did not check prior to flashing) to make groupings so much worse or did I just miss something in the configuration?

 

Thanks in advance!

 

Edited by HumanTechDesign
Moved BIOS Info further up

  • Quote
    • 5 months later...
    • Author

    As I have never seen an answer to that, but I'm still looking into this issue: Bump.

  • Quote

    You should try enable/disable "PCIe ACS override" or ACS in BIOS. BIOS ver. usually haven't much different.

     

    image.png.5a14e2f667de4efb4fdb74b2ddd7c64c.png

    Edited by Vr2Io

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