Hi Vic,
It probably does not hurt to state that if you require real-time
responsiveness, you should *not* be using a VM. There are no latency
guarantees.
You forgot to mention the most relevant fact... which svn revision of
the OSE source code are you actually using? In fact you expect any kind
of technical support, you might as well start by providing a VBox.log
because all the information is in there.
How exactly do you measure the delay? I assume it's from the device
calling PDMDevHlpPCISetIrq to the guest accessing some device register
in the ISR?
There might be problems specific to Windows 8.1(?) hosts. If you could
repeat the test on a different host OS (ideally not Windows), that might
provide some hints.
I don't know of anything in particular that would happen every 500 ms
in VirtualBox, but it doesn't have to be the VM, it could be the host
doing something as well.
Regards,
Michal
On 6/15/2016 8:51 AM, llyzs wrote:
Hi Devs,
I have a virtual PCI device added on VirtualBox OSE and a driver which
sends I/O to do some stuff in the host and receive interrupts when the
work is done. The interrupts work most of the time, however there are
random delays between PDMDevHlpPCISetIrq is called and the driver ISR is
called. Most of the time there is no delay (<1ms) but periodically there
is a delay from 10+ms to even 60+ms. One more strange thing is that the
delay mostly happen at exactly every 500ms. So anyone can give me some
hint on what is causing the interrupt delay? What kind of job inside
VirtualBox that runs every 500ms that might be causing interrupt delay?
I am on Windows 8.1 x64 (both guest and host). Thanks in advanced.
Vic
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