Henry Vermaak wrote:
On 25 March 2011 18:33, Marco van de Voort <mar...@stack.nl> wrote:
On Fri, Mar 25, 2011 at 03:34:07PM +0000, Henry Vermaak wrote:
The Cortex A8 (armv7) is 2 generations newer than the Kirkwood processor
on open-rd (armv5). It's got almost twice the DMIPS/MHz. I'd be very
surprised if it's slower.
Interesting, do you have an URL to those benchmarks?
Google can get you quite far. ARM9 is usually quoted to have 1.1 DMIPS/MHz:
http://hubpages.com/hub/The-ARM-family
Wikipedia says that Cortex A8 is "up to 2 DMIPS/Mhz". Of course, if
you have a floating point intensive app, you can get much bigger
gains.
Everybody knows that benchmarks are odious, but I've got a handy
"torture test" that I've run on a variety of systems from a 16-way Sun
down to a "Slug". Usefully, this can be used both to get a time to
completion of the standard job and a Watt-minutes figure, both of which
are significant when choosing systems:
SPARCserver 1000E, 8 jobs, 550W (560VA) 1m51.926s 1,018
E4500 8x SMP 400MHz 4Gb 16 jobs, 772W (845VA) 0m31.025s 399
Compaq ProLiant ML530 G2, 2.8GHz, 3Gb, 8 jobs, 390W 0m12.170 79
Linksys NSLU2, 266MHz 32Mb, 1 job, 7W 6m35.014s 46
It doesn't exercise network functions, but my experience is that these
are comparatively cheap compared with compression etc. that it does.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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