[Qemu-devel] irq latency and tcg

[Artyom Tarasenko <atar4qemu@googlemail.com>]

Can it be that qemu (-system-sparc in my case, but I guess it's more
or less similar on all platforms) reacts to irqs slower than a real
hardware due to tcg optimizations?

I see one test pattern which fails on qemu:

<cause an interrupt>
nop * N
<check whether the interrupt happened>

What I observe is that the proper interrupt does take a place, but
after the check, so no-one expects it anymore.
Is there a way to reduce the interrupt latency? Or maybe there is a
good substitute to a nop*N, so that irq would definitely get through
in the mean time?

Artyom