On Fri, 17 Mar 2017 00:31:55 -0400
"[email protected]" <[email protected]> wrote:
> I have enabled MSI through the windows registry tweak but I am wondering
> if I can bump that up to MSI-X somehow.
>
> I ask here and not on a windows forum because I have no idea if the card
> supports this natively (and I have no bare metal windows machines to
> test it on)
MSI-X is probably not supported by the graphics card. Run 'sudo lspci
-vs <address>' where address is the PCI bus address of the device, like
01:00.0. For example:
# lspci -vs 1:00.0
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750]
(rev a2) (prog-if 00 [VGA controller])
Subsystem: eVga.com. Corp. Device 2753
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f0000000 (64-bit, prefetchable) [size=32M]
I/O ports at e000 [size=128]
Expansion ROM at f7000000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Legacy Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [250] Latency Tolerance Reporting
Capabilities: [258] L1 PM Substates
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024
<?>
Capabilities: [900] #19
Kernel driver in use: vfio-pci
Kernel modules: nouveau
There's no MSI-X capability, only MSI. Or:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 06)
Subsystem: ASUSTeK Computer Inc. P8P67 and other motherboards
Flags: bus master, fast devsel, latency 0, IRQ 45
I/O ports at d000 [size=256]
Memory at f2104000 (64-bit, prefetchable) [size=4K]
Memory at f2100000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 10-04-00-00-68-4c-e0-00
Kernel driver in use: r8169
Kernel modules: r8169
Which supports both, but is currently using MSI (Enable+ vs Enable-).
Even the big iron NVIDIA cards don't support MSI-X.
Also, MSI-X isn't a "bump up" from MSI, the difference between the two
is largely in how multiple vectors are allocated and managed by the
OS. If a device only supports a single interrupt vector, there's
no advantage to using MSI-X over MSI. The interrupt signaling
mechanism between the two is identical, it's only the configuration
that is different. Thanks,
Alex
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