Re: [RFC PATCH] PCI: remove access to pci_[enable|disable]_msi() for drivers - take 2

Andi Kleen
2005-06-09T14:04:05Z

On Wed, Jun 08, 2005 at 08:52:26AM -0700, Roland Dreier wrote:
> Andi> x86-64 will eventually too, I definitely plan for it at some
> Andi> point. We need it for very big machines where 255 interrupt
> Andi> vectors are not enough. And as you say with MSI-X it becomes
> Andi> even more important.
>
> MSI-X already works fine on x86-64. For example, on the machine I'm

Yes, but only as long as you dont have too many devices. The problem
is that there are only 255 interrupt vectors right now, and that
is not enough for bigger systems with many devices.

> sending this from, an Athlon64 system with Nforce 4 (and yes I am
> using IP-over-InfiniBand as the only network connection on my workstation):

A single CPU box does not even appear on the radar here.

-Andi