[Xen-devel] Re: [PATCH 1/2] xen: events: do not workaround too-small nr_irqs

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Wed, 2011-02-09 at 16:21 +0000, Konrad Rzeszutek Wilk wrote:
> On Wed, Feb 09, 2011 at 11:10:44AM +0000, Ian Campbell wrote:
> > This workaround was somewhat useful prior to the introduction of the
> > core irq allocator and 026c9d2d0d75 "xen: events: allocate GSIs and
> > dynamic IRQs from separate IRQ ranges." but should not be unnecessary now.
> > 
> > If nr_irqs turns out to be too small under Xen then we use (or define
> > if necessary) the interfaces to increase nr_irqs rather than working
> > around the core allocator in this way.
> > 
> > In my configuration NR_IRQS ends up being 2304 with nr_irq_gsi 272
> > which is sufficient.
> 
> Is this configuration where you run Xen + Linux under QEMU?

I've just tried these two patches under qemu, booting a 64 bit
xen-unstable hypervisor with a 32 bit domain 0 kernel, pxeboot using:
        qemu-system-x86_64 -m 256 -vnc 0.0.0.0:1 -k en-gb -serial stdio -boot 
nc \
                -usb -usbdevice tablet -net 
nic,vlan=0,macaddr=00:16:3e:f7:c4:1d,model=e1000 \
                -net tap,vlan=0,ifname=tapQEMU.0 -hda /dev/VG/debian-HVM-1 
        
There I appear to get:
        nr_irqs_gsi: 272
        NR_IRQS:2304 nr_irqs:256 16

which leads to a failure due to not being able to allocate a dynamic IRQ
(because 272 > 256!), I'll dig into this...

Ian.



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