Message Signalled Interrupts Question ...

Rui Paulo rpaulo at
Fri May 11 02:25:44 UTC 2007

At Fri, 11 May 2007 10:10:15 +0800,
Wilkinson, Alex wrote:
> Howdy,
> How does one know whether their PCI device supports MSI
> and that FreeBSD is using MSI for this device ?

You can boot with verbose mode on and the info will show up on dmesg.

For example
found-> vendor=0x11ab, dev=0x4362, revid=0x22
        bus=1, slot=0, func=0
        class=02-00-00, hdrtype=0x00, mfdev=0
        cmdreg=0x0007, statreg=0x0010, cachelnsz=64 (dwords)
        lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
        intpin=a, irq=11
        powerspec 2  supports D0 D1 D2 D3  current D0
        MSI supports 2 messages, 64 bit

Rui Paulo

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