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M. Tibbits
Asked: 2011-01-06 20:34:17 +0800 CST

如何确定哪个 GPU 卡在 PCI Express 2.0 x16 上运行以及哪个 GPU 卡在使用 x8？

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有没有办法确定特定卡的 PCI Express 连接速度？我插了三张卡：

两个 Nvidia GTX 480（一个 x16 和一个 x8） 一个 Nvidia GTX 460 在 x8 上运行

有什么方法可以通过 C 中的函数调用或通过选项来lspci确定显卡的总线速度吗？当我只将其中一张卡用于我的 CUDA 程序时，我想使用在 x16 上运行的卡。

谢谢！

注意： lspci -vvv转储

对于两个 GTX 480。我没有看到任何与总线速度有关的差异。

03:00.0 VGA compatible controller: nVidia Corporation Device 06c0 (rev a3)
        Subsystem: eVga.com. Corp. Device 1480
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at d4000000 (32-bit, non-prefetchable) [size=32M]
        Region 1: Memory at b0000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at bc000000 (64-bit, prefetchable) [size=64M]
        Region 5: I/O ports at df00 [disabled] [size=128]
        [virtual] Expansion ROM at b8000000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidia, nvidiafb, nouveau

03:00.1 Audio device: nVidia Corporation Device 0be5 (rev a1)
        Subsystem: eVga.com. Corp. Device 1480
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin B routed to IRQ 5
        Region 0: [virtual] Memory at d7ffc000 (32-bit, non-prefetchable) [disabled] [size=16K]
        Capabilities: <access denied>

04:00.0 VGA compatible controller: nVidia Corporation Device 06c0 (rev a3)
        Subsystem: eVga.com. Corp. Device 1480
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at dc000000 (32-bit, non-prefetchable) [size=32M]
        Region 1: Memory at c0000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at cc000000 (64-bit, prefetchable) [size=64M]
        Region 5: I/O ports at cf00 [size=128]
        [virtual] Expansion ROM at c8000000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidia, nvidiafb, nouveau

04:00.1 Audio device: nVidia Corporation Device 0be5 (rev a1)
        Subsystem: eVga.com. Corp. Device 1480
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin B routed to IRQ 5
        Region 0: Memory at dfffc000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

我看到的唯一区别与内存映射有关：

myComputer:~> diff card1 card2
3c3
< Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
---
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
7,11c7,11
< Region 0: Memory at d4000000 (32-bit, non-prefetchable) [size=32M]
< Region 1: Memory at b0000000 (64-bit, prefetchable) [size=128M]
< Region 3: Memory at bc000000 (64-bit, prefetchable) [size=64M]
< Region 5: I/O ports at df00 [disabled] [size=128]
< [virtual] Expansion ROM at b8000000 [disabled] [size=512K]
---
> Region 0: Memory at dc000000 (32-bit, non-prefetchable) [size=32M]
> Region 1: Memory at c0000000 (64-bit, prefetchable) [size=128M]
> Region 3: Memory at cc000000 (64-bit, prefetchable) [size=64M]
> Region 5: I/O ports at cf00 [size=128]
> [virtual] Expansion ROM at c8000000 [disabled] [size=512K]
18c18
< Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
---
> Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
19a20
> Latency: 0, Cache Line Size: 64 bytes
21c22
< Region 0: [virtual] Memory at d7ffc000 (32-bit, non-prefetchable) [disabled] [size=16K]
---
> Region 0: Memory at dfffc000 (32-bit, non-prefetchable) [size=16K]
graphics

2 个回答

  1. Best Answer

    我试过这个：cat /var/log/Xorg.0.log | grep "NVIDIA"

    它将显示卡以及它们在哪个 PCI Express 插槽中以及该插槽的宽度是多少。例如：

    20.502] (II) NVIDIA(0): NVIDIA GPU GeForce 9500 GT (G96) at PCI:1:0:0 (GPU-0)
    [ 20.502] (--) NVIDIA(0): Memory: 1048576 kBytes
    [ 20.502] (--) NVIDIA(0): VideoBIOS: 62.94.1f.00.8a
    [ 20.502] (II) NVIDIA(0): Detected PCI Express Link width: 16X
    [ 20.502] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
    [ 20.502] (--) NVIDIA(0): Connected display device(s) on GeForce 9500 GT at PCI:1:0:0
    [ 20.502] (--) NVIDIA(0): Samsung SyncMaster (CRT-1)
    [ 20.502] (--) NVIDIA(0): Samsung SyncMaster (CRT-1): 400.0 MHz maximum pixel clock

    • 3

  2. 这是一个非常古老的问题，但是正确执行此操作的方法是运行

    sudo lspci -vv

    对于每个 pci-e 设备，它列出了 LnkSta，它告诉您速度为 _ GT/s，宽度 x1。它还列出了 LnkCap，即链路容量。

    2.5 GT/s = PCI-e gen 1, 5 GT/s = PCI-e gen 2, 8 GT/s = PCI-e gen 3，宽度为通道数。

    • 3

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