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Re: [Qemu-discuss] Increasing speed of guest OS

From: Dale R. Worley
Subject: Re: [Qemu-discuss] Increasing speed of guest OS
Date: Wed, 30 Jul 2014 12:06:06 -0400

> From: chester tinemas <address@hidden>
> I am trying to increase the speed at which a guest runs in Qemu, so that I
> can run a regression test on software within the guest OS in a shorter
> amount of time. Hopefully this would allow a test that would take 6 hours
> normally take less when run inside qemu. Is this possible using qemu or
> other software, I've had a look into operators such as -icount but this
> doesn't seem to be exactly what I'm looking for.

The first step is to ensure that Qemu is using KVM so that the bulk of
the guest's instructions are executed directly by the hardware.

Of course, Qemu has overheads, so the guest will never run as fast in
Qemu as it would if it was running directly on the hardware.

If I understand you correctly, you want to make the guest run faster
than it would if it ran on hardware.  The only way to do that is to
have Qemu itself running on hardware that is much faster than the
hardware the guest normally runs on.


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