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Re: [Qemu-devel] emulated ARM performance vs real processor ?

From: Peter Maydell
Subject: Re: [Qemu-devel] emulated ARM performance vs real processor ?
Date: Sun, 4 Sep 2011 19:44:49 +0100

On 4 September 2011 18:42, Antti P Miettinen <address@hidden> wrote:
> The emulation
> speed depends on how core intensive vs memory intensive your workload
> is. Workloads that are memory bound in the target (e.g. gzip ASCII
> compression) can me emulated much faster (e.g. factor of two) than core
> bound workloads (e.g. mcrypt encryption).

Another factor is that if the workload makes heavy use of floating point
or SIMD instructions (VFP and Neon) then QEMU will do comparatively worse
than for a pure integer workload, because we have to emulate all the
fp calculations in software.

-- PMM

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