RE: [PATCH] 2.5.68 Fix IO_APIC IRQ assignment bug

[Nakajima, Jun]

> I know there are more people who want to get rid of NR_IRQS e.g. due to
> very sparse irq distribution. For one of the platforms i'm interested in,
> we have to make a clear distinction between irqs and vectors so that we
> can have seperate vector allocations per interrupt handling domain. I
> believe IA-64 does the same but instead per cpu (our domain/node consists
> of 4 cpus) NR_IRQS gets in the way due to it being set at 224 when we
> actually

I heard such requests too, and suggested the same thing, i.e. seperate vector allocations per interrupt handling domain. 

> can service NR_IRQ_VECTORS * NUM_MAXNODES I/O vectors. Can you post your
> patch?

Yes, we'll post it after cleanups.

> 
> Also what MSI devices are you using?
> 

Adaptec 39320 SCSI HBA (it has the 7902 ASIC), which has two MSI-capable functions. You don't need to change the driver (aic79xx) to enable MSI.

Thanks,
Jun