GPU PCIe link speed

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From	Grzesiek <pld@sojka.co>
Newsgroups	linux.debian.user
Subject	GPU PCIe link speed
Date	Fri, 21 Jan 2022 23:10:02 +0100
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Hi there,

I noticed that all my GPU operate at PCIe 1.1=2.5GHz instead of PCIe 
2.0/3.0. Is there any way to force higher speed?

Hardware details below

---===### First system ###===---

CPU: i7-3770, Linux version 5.15.0-2-amd64

# dmesg  | grep bandwidth
[    0.224924] pci 0000:01:00.0: 16.000 Gb/s available PCIe bandwidth, 
limited by 2.5 GT/s PCIe x8 link at 0000:00:01.0 (capable of 126.016 
Gb/s with 8.0 GT/s PCIe x16 link)

# lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core 
processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core 
processor PCI Express Root Port (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset 
Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family 
USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family 
High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI 
Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset 
Family PCI Express Root Port 2 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family 
USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Z77 Express Chipset LPC Controller 
(rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series/C210 Series Chipset 
Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus 
Controller (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GK110 [GeForce GTX 
780] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GK110 High Definition Audio 
Controller (rev a1)
03:00.0 Ethernet controller: Qualcomm Atheros Killer E220x Gigabit 
Ethernet Controller (rev 13)
04:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI 
Bridge (rev 03)

---===### Second system ###===---

CPU: i5-2500k, Linux version 5.15.0-2-amd64

# dmesg  | grep bandwidth
[    0.285635] pci 0000:03:00.0: 32.000 Gb/s available PCIe bandwidth, 
limited by 2.5 GT/s PCIe x16 link at 0000:02:00.0 (capable of 126.016 
Gb/s with 8.0 GT/s PCIe x16 link)

# lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor 
Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core 
Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series 
Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network 
Connection (rev 05)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset 
Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset 
Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset 
Family PCI Express Root Port 1 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset 
Family PCI Express Root Port 3 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset 
Family PCI Express Root Port 4 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset 
Family PCI Express Root Port 5 (rev b5)
00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset 
Family PCI Express Root Port 7 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset 
Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation P67 Express Chipset LPC Controller 
(rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset 
Family 6 port Desktop SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family 
SMBus Controller (rev 05)
01:00.0 PCI bridge: NVIDIA Corporation NF200 PCIe 2.0 switch (rev a3)
02:00.0 PCI bridge: NVIDIA Corporation NF200 PCIe 2.0 switch (rev a3)
02:02.0 PCI bridge: NVIDIA Corporation NF200 PCIe 2.0 switch (rev a3)
03:00.0 VGA compatible controller: NVIDIA Corporation GM204 [GeForce GTX 
970] (rev a1)
03:00.1 Audio device: NVIDIA Corporation GM204 High Definition Audio 
Controller (rev a1)
06:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet 
Controller (Copper) (rev 06)
07:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series 
Firewire Controller (rev 01)
08:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host 
Controller (rev 04)
09:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network 
Connection

---===### Third system ###===---

CPU: Ryzen 7 1700, Linux version 5.10.0-10-amd64

# dmesg  | grep bandwidth
[    0.647668] pci 0000:22:00.0: 32.000 Gb/s available PCIe bandwidth, 
limited by 2.5 GT/s PCIe x16 link at 0000:00:03.1 (capable of 126.016 
Gb/s with 8.0 GT/s PCIe x16 link)

# lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 
00h-0fh) I/O Memory Management Unit
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) PCIe GPP Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) PCIe GPP Bridge
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:07.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Internal PCIe GPP Bridge 0 to Bus B
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-1fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Internal PCIe GPP Bridge 0 to Bus B
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller 
(rev 59)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge 
(rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) Data Fabric: Device 18h; Function 7
03:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 300 Series 
Chipset USB 3.1 xHCI Controller (rev 02)
03:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] 300 Series 
Chipset SATA Controller (rev 02)
03:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b2 (rev 02)
1d:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series 
Chipset PCIe Port (rev 02)
1d:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series 
Chipset PCIe Port (rev 02)
1d:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series 
Chipset PCIe Port (rev 02)
1e:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
1f:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI 
Bridge (rev 04)
21:00.0 RAID bus controller: Broadcom / LSI MegaRAID SAS 2208 
[Thunderbolt] (rev 05)
22:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 
750] (rev a2)
22:00.1 Audio device: NVIDIA Corporation GM107 High Definition Audio 
Controller [GeForce 940MX] (rev a1)
23:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, 
Inc. [AMD] Zeppelin/Raven/Raven2 PCIe Dummy Function
23:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 
17h (Models 00h-0fh) Platform Security Processor
23:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) USB 3.0 Host Controller
24:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, 
Inc. [AMD] Zeppelin/Renoir PCIe Dummy Function
24:00.2 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA 
Controller [AHCI mode] (rev 51)
24:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 00h-0fh) HD Audio Controller

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GPU PCIe link speed Grzesiek <pld@sojka.co> - 2022-01-21 23:10 +0100
  Re: GPU PCIe link speed Sarunas Burdulis <sarunas@math.dartmouth.edu> - 2022-01-24 20:20 +0100

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