Re: CVS commit: src/sys/arch/xen

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, May 16, 2020 at 02:51:43PM +1000, matthew green wrote:
> "Jaromir Dolecek" writes:
> > Module Name:	src
> > Committed By:	jdolecek
> > Date:		Fri May 15 07:42:58 UTC 2020
> > 
> > Modified Files:
> > 	src/sys/arch/xen/include: intr.h
> > 	src/sys/arch/xen/x86: pintr.c
> > 
> > Log Message:
> > use short for irq2port[] to save memory (4KB), it only needs to store
> > numbers <= NR_EVENT_CHANNELS (2048)
> 
> not that they're necessarily related, but you can have a look
> at PR#54837 which has problems with running out of interrrupts
> on systems with lots of cpus and devices with lots of msix?

It's not related in any way to Xen. In fact, a kernel running under
Xen PV could avoid this issue.

I have plans to update the per-cpu interrupt mask from 32 to 48 bits
(it's not possible to go to 64 bits as suggested in the PR). Making the
idtvect per-CPU is another topic.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--