Date: Thu, 09 Oct 2008 19:15:22 -0400 From: mike@sentex.net To: freebsd-questions@freebsd.org Subject: Re: irq256 ???? Message-ID: <5r3te4946bdoqso2ull1g1c4p7dsdhdua4@4ax.com> In-Reply-To: <20081009214954.GA31617@owl.midgard.homeip.net> References: <20081009225136.6ca47d3b@Picasso.Zahemszky.HU> <20081009214954.GA31617@owl.midgard.homeip.net>
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On Thu, 9 Oct 2008 23:49:54 +0200, in sentex.lists.freebsd.questions
you wrote:
>>
>> What's that? (world and kernel are in sync)
>
>It is an MSI-style interrupt [MSI=Message Signaled Interrupt] (available on
>PCI-E devices and a few PCI/PCI-X devices.) They get allocated fake
>irq-numbers starting at 256.
>
>I.e. it is a feature, and a bug or indication of any problem.
And you can see what devices are MSI capable with
pciconf -lvc
e.g
em0@pci0:5:0:0: class=0x020000 card=0x348d8086 chip=0x108c8086
rev=0x03 hdr=0x00
vendor = 'Intel Corporation'
device = '82573E Intel Corporation 82573E Gigabit Ethernet
Controller (Copper)'
class = network
subclass = ethernet
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
cap 10[e0] = PCI-Express 1 endpoint
---Mike
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