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Re: [Qemu-devel] QEMU ARM SMP: IPI delivery delayed until next main loop


From: Paolo Bonzini
Subject: Re: [Qemu-devel] QEMU ARM SMP: IPI delivery delayed until next main loop event // how to improve IPI latency?
Date: Fri, 19 Jun 2015 18:57:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0


On 12/06/2015 18:38, Alex Züpke wrote:
>   CPU #0                       CPU #1
>   ======                       ======
>   ... other stuff ...          WFI (wait for interrupt, like x86 "HLT")
>   send SGI in MPCore
>   polls for completeness
>                  <time passes ...>
>   polls ...
>                  <... and passes ...>
>   still polls ...
>                  <... and passes ...>
>   still polls ...
>                  <... and passes ...>

Shouldn't CPU#0 do a WFE here?  That would work too.

Considering that sooner or later we'll have true multithreaded
emulation, putting a hack doesn't sound like a great prospect.

Paolo



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