Explanation of kernel parameter

[smolloy]

Can anyone tell me what the following kernel parameter does, or let me know where I can find out?

pci=nomsi

Thanks.

[pavlo_7]

Hi smolloy,

I found these:

+               msi             [MSI] If the PCI_MSI kernel config parameter is
+                               enabled, this kernel boot option can be used to
+                               enable the use of MSI interrupts system-wide.
                nomsi           [MSI] If the PCI_MSI kernel config parameter is
                                enabled, this kernel boot option can be used to
                                disable the use of MSI interrupts system-wide.

at Re: Make "pci=nomsi" the default on 2.6.20 kernels?

and

¨MSI, Message Signaled Interrupts, uses in-band pci memory space message to raise interrupt, instead of conventional out-band pci INTx pin.¨
at
How does MSI/MSI-X work - MSI part? : Charlie Chen's Weblog

Hope this helps.

[smolloy]

Thanks pavlo_7

I came across it while trying to fix a big in alsa, but I'm not sure if it works yet.