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From Igor Galić <i.ga...@brainsware.org>
Subject Re: Theory on recent Phoronix benchmark?
Date Wed, 06 Apr 2011 07:17:37 GMT


----- Original Message -----
> http://www.phoronix.com/scan.php?page=article&item=ubuntu_natty_pae64&num=3
> 
> "When it comes to running the Apache web-server in these different
> configurations, there is a 3% improvement when moving from the i686
> to i686 PAE kernel and 2% on top of that when moving to the x86_64
> Ubuntu. With the newer Core i7 Sandy Bridge notebook there is a 6%
> boost in performance with the PAE kernel, but the 64-bit performance
> strangely suffers a setback. In this test and the rest, they are
> built from source for the respective architecture."
> 
> Anyone have any theory on why 64-bit was so much worse (suggest

On 64-bit on Core i7 (in this benchmark) -- that's a little more
specific. So it'd be worth looking at these two CPUs and see where
they differ:

Intel Core 2 Duo T9300 (2.50GHz dual-core) 
http://ark.intel.com/Product.aspx?id=33917 vs

Core i7 2820QM (2.30GHz quad-core + Hyper Threading)
http://ark.intel.com/Product.aspx?id=52227

Which in essence is: 6MB L2 Cache vs 8MB L2 Cache.


> looking at general article for context rather than solely the except
> above)?
> 
> -Andy

i

-- 
Igor Galić

Tel: +43 (0) 664 886 22 883
Mail: i.galic@brainsware.org
URL: http://brainsware.org/

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