linux-kernel - Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable

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Date:	Mon, 28 Oct 2013 12:30:48 -0400
From:	Mark Lord <kernel@...rt.ca>
To:	Alexander Gordeev <agordeev@...hat.com>,
	David Laight <David.Laight@...LAB.COM>
CC:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() family
 helpers

On 13-10-25 06:01 AM, Alexander Gordeev wrote:
>
> If this problem really exists anywhere besides pSeries?
> 
> I can imagine x86 hitting lack of vectors in interrupt table when
> number of CPUs exceeds hundreds, but do we have this problem now?

An awful lot of x86 hardware has a 256 (255?) vector limit for MSI/MSI-X.
Couple that with PCIe Virtual Functions, each wanting 16 vectors (for example),
and that limit is really simple to exceed today.

But this is more a problem for a sysadmin, and I am happy with the current
and the proposed methods.

Cheers
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