[Qemu-devel] Re: irq latency and tcg

[Artyom Tarasenko]

2009/12/7 Blue Swirl <address@hidden>:
> On Mon, Dec 7, 2009 at 3:30 PM, Artyom Tarasenko
> <address@hidden> wrote:
>> 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?
>
> On Sparc, nops do not generate any code at all.

But "qemu: fatal: Raised interrupt while not in I/O function" is still
a bug, right?