PCI-MSI-edge in /proc/interrupts

J.Hwan Kim

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Aug 8, 2011, 5:00:02 AM8/8/11

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Hi, everyone

When I read /proc/interrupts, it displays interrupt type of my ethernet
card with "PCI-MSI-edge".
Does it mean MSI-X interrupt or MSI interrupt?
I set to my ethernet driver operates with MSI-X interrupt.

Thanks in advance.

Best Regards,
J.Hwan Kim

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Camaleón

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Aug 8, 2011, 1:30:03 PM8/8/11

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On Mon, 08 Aug 2011 17:57:49 +0900, J.Hwan Kim wrote:

> When I read /proc/interrupts, it displays interrupt type of my ethernet
> card with "PCI-MSI-edge".

Mmm, I get two modes for each of my ethernet devices:

sm01@stt008:~$ grep -i eth /proc/interrupts
20: 1 0 0 0 IO-APIC-fasteoi eth1
1276: 104018 104203 104044 103894 PCI-MSI-edge eth0

I wonder what's the difference between those two :-?

> Does it mean MSI-X interrupt or MSI interrupt? I set to my ethernet
> driver operates with MSI-X interrupt.

As per this post:

http://www.mail-archive.com/e1000...@lists.sourceforge.net/msg02598.html

I'd say if msi-x is enabled it should be present.

Greetings,

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Camaleón

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Henrique de Moraes Holschuh

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Aug 8, 2011, 11:00:02 PM8/8/11

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On Mon, 08 Aug 2011, J.Hwan Kim wrote:
> ethernet card with "PCI-MSI-edge".
> Does it mean MSI-X interrupt or MSI interrupt?

It could be either. Use lspci -vvv as root to check whether MSI or MSI-X is
active on the device.

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them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh

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Henrique de Moraes Holschuh

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Aug 8, 2011, 11:20:02 PM8/8/11

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On Mon, 08 Aug 2011, Camaleón wrote:
> On Mon, 08 Aug 2011 17:57:49 +0900, J.Hwan Kim wrote:
> > When I read /proc/interrupts, it displays interrupt type of my ethernet
> > card with "PCI-MSI-edge".
>
> Mmm, I get two modes for each of my ethernet devices:
>
> sm01@stt008:~$ grep -i eth /proc/interrupts
> 20: 1 0 0 0 IO-APIC-fasteoi eth1
> 1276: 104018 104203 104044 103894 PCI-MSI-edge eth0
>
> I wonder what's the difference between those two :-?

Basically, MSI and MSI-X scale a lot better and are faster to process.

They're device-specific (and often device-function-specific), so they're
never shared with other devices.

--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh

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