Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() familyhelpers

From: Mark Lord
Date: Mon Oct 28 2013 - 12:31:14 EST

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.

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