Cortex performance

By: Howard Chu (hyc.delete@this.symas.com), September 19, 2009 11:57 am
Room: Moderated Discussions
Tom W (twerges@hotmail.com) on 9/19/09 wrote:
---------------------------
>Linus Torvalds (torvalds@linux-foundation.org) on 9/17/09 wrote:
>---------------------------
>>I like the coremark thing. Sure, ARM probably picked the
>>absolute best case, but if the power-optimized 800MHz
>>dual-core Cortex-A9 is competitive with Atom at 1.6GHz
>>(with HT), on that thing, then it likely means that the
>>performance-optimized version will trash Atom quite well
>>in general.
>
>Coremark is like SPECINT_RATE; when it's applied to multiple cores, it runs separate
>copies of the benchmark on each core then adds the results.
>
>The dual-core cortex was being compared against a single-core atom, which was not
>fair. It should be compared against a dual-core atom, in which case the coremark scores would probably be similar.
>
>Furthermore, the cortex a9 is not in silicon yet and is being compared to a part
>that was released a long time ago, which is unfair. The performance-optimized cortex
>a9 should be compared to a dual-core pineview atom when it's released.

Dunno anything about Cortex A9, but the Cortex A8 running in my Touchbook at 600MHz runs my multithreaded server test in just about 5x as much time as on my 2.1GHz dual-core Turion ZM-80 (16.4 seconds vs 81.8 seconds). This isn't a huge test obviously, since it still fits in the 256MB of the OMAP3530's RAM. Both machines running Linux kernel 2.6.29, glibc 2.9, code compiled with gcc 4.3.3.
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