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Re: [Qemu-devel] guest host time synchronization

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] guest host time synchronization
Date: Tue, 18 Apr 2017 15:32:17 +0100
User-agent: Mutt/1.8.0 (2017-02-23)

On Tue, Apr 11, 2017 at 09:01:40AM +0200, Jiahuan Zhang wrote:
> I made a test to check the time difference of QEMU emulated ARM-based Linux
> guest and the Windows host. The result is, the guest time is around 0.2
> second faster than the host. I used the "-rtc base" option.
> So can I say that, the time precision of QEMU emulation is in seconds? Is
> it possible to make it more precise? because I need to test the latency of
> my guest/host communication with high time resolution, at least in
> miliseconds.
> Please let me know if you have any method  for the communication
> performance testing. Thank you very much.

This can depend on the exact board (machine type) being emulated because
the emulated clock and timer hardware may be different.

Please share your QEMU command-line so we can see the exact ARM guest
hardware configuration.


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