On Thu, May 21, 2020 at 08:42:34PM +0100, Mark Cave-Ayland wrote:
> > Can you tell me a bit more about the host in terms of CPU and disk to help figure out
> > what's going on?
phenom II X6 1100T (6-way 3.3GHz), 8Gb RAM (4Gb given to guest), WDC WD10EACS-00D
disk (hdparm -tT gives
Timing cached reads: 6988 MB in 2.00 seconds = 3494.96 MB/sec
Timing buffered disk reads: 280 MB in 3.02 seconds = 92.75 MB/sec
)
> One other thought I had is that somehow the IVEC IRQs are managing to be overwritten
> on a faster host before being read by the guest. Does the following patch display the
> FATAL message at the point where things hang?
> diff --git a/hw/pci-host/sabre.c b/hw/pci-host/sabre.c
> index fae20ee97c..618ebd1300 100644
> --- a/hw/pci-host/sabre.c
> +++ b/hw/pci-host/sabre.c
> @@ -63,6 +63,9 @@
> static inline void sabre_set_request(SabreState *s, unsigned int irq_num)
> {
> trace_sabre_set_request(irq_num);
> + if (s->irq_request != 0 && s->irq_request != NO_IRQ_REQUEST) {
> + fprintf(stderr, "FATAL: still waiting for IRQ %x, now %x\n", s->irq_request,
> irq_num);
> + }
> s->irq_request = irq_num;
> qemu_set_irq(s->ivec_irqs[irq_num], 1);
> }
I have to go AFK right now, will test when I get back (should be about an
hour or two)
