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

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Date:	Fri, 25 Oct 2013 12:01:04 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Mark Lord <kernel@...rt.ca>, 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 Fri, Oct 25, 2013 at 10:10:02AM +0100, David Laight wrote:
> What this doesn't resolve is a driver requesting a lot of interrupts
> early on and leaving none for later drivers.

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?

> Really the system needs to allocate the minimum number to all
> drivers before giving out any extra ones - I've NFI how this
> would be arranged!

Do not know. The pSeries quota approach seems more reasonable to me.

> 	David

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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