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  #1  
Old 19th March 2010, 06:30 PM
Milena Offline
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Join Date: Mar 2009
Location: Europe
Posts: 304
linuxfedorafirefox
MSI/Message Signaled Interrupts - Nvidia GPU

Hi

I've read on Nvidia forums that using Message Signaled Interrupts *should* have an advantage but it is not enabled by default as its known to not work on many hardware configurations.
A snippet of cat /proc/interrupts:

Code:
          CPU0       CPU1       CPU2       CPU3       
 17:          5          4          0         52   IO-APIC-fasteoi   firewire_ohci
 19:          0          0     188043        857   IO-APIC-fasteoi   nvidia
 20:      51279      23962          1         59   IO-APIC-fasteoi   ohci_hcd:usb3
 23:          0          0          0          0   IO-APIC-fasteoi   ohci_hcd:usb4
 27:          1      27922      14110       6741   PCI-MSI-edge      ahci
 28:      23770     106265          2        135   PCI-MSI-edge      eth0
Snippet of dmesg:

Code:
pci 0000:00:08.0: Enabling HT MSI Mapping
pci 0000:00:09.0: Enabling HT MSI Mapping
pcieport 0000:00:13.0: irq 25 for MSI/MSI-X
So MSI appears to be enabled and working on my system but not for the nvidia card, a PCIe GTX275.
Running this command as root is supposed to enable MSI for the Nvidia Kernel Module:

Code:
cd /lib/modules/2.6.32.9-70.fc12.x86_64/kernel/drivers/video
insmod nvidia.ko NVreg_EnableMSI=1
but the error message i get is:
Code:
insmod: error inserting 'nvidia.ko': -1 File exists
modinfo:
Code:
filename:       /lib/modules/2.6.32.9-70.fc12.x86_64/kernel/drivers/video/nvidia.ko
license:        NVIDIA
alias:          char-major-195-*
alias:          pci:v000010DEd00000E00sv*sd*bc04sc80i00*
alias:          pci:v000010DEd00000AA3sv*sd*bc0Bsc40i00*
alias:          pci:v000010DEd*sv*sd*bc03sc02i00*
alias:          pci:v000010DEd*sv*sd*bc03sc00i00*
depends:        i2c-core
vermagic:       2.6.32.9-70.fc12.x86_64 SMP mod_unload 
parm:           NVreg_EnableVia4x:int
parm:           NVreg_EnableALiAGP:int
parm:           NVreg_ReqAGPRate:int
parm:           NVreg_EnableAGPSBA:int
parm:           NVreg_EnableAGPFW:int
parm:           NVreg_Mobile:int
parm:           NVreg_ResmanDebugLevel:int
parm:           NVreg_RmLogonRC:int
parm:           NVreg_ModifyDeviceFiles:int
parm:           NVreg_DeviceFileUID:int
parm:           NVreg_DeviceFileGID:int
parm:           NVreg_DeviceFileMode:int
parm:           NVreg_RemapLimit:int
parm:           NVreg_UpdateMemoryTypes:int
parm:           NVreg_UseVBios:int
parm:           NVreg_RMEdgeIntrCheck:int
parm:           NVreg_UsePageAttributeTable:int
parm:           NVreg_EnableMSI:int
parm:           NVreg_MapRegistersEarly:int
parm:           NVreg_RegistryDwords:charp
parm:           NVreg_NvAGP:int

How do I enable this feature and is it recommend to make use of it in general ? I doubt the performance gain will be notable but everything helps, I also heard suspend will be broken when using MSI but that's not a problem for me.

Thanks in Advance
  #2  
Old 23rd March 2010, 03:18 AM
Milena Offline
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Join Date: Mar 2009
Location: Europe
Posts: 304
linuxfedorafirefox
Re: MSI/Message Signaled Interrupts - Nvidia GPU

Has been solved.

If other users are interested to make use of MSI with Nvidia GTX200 series: http://www.nvnews.net/vbulletin/showthread.php?t=149171
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