Date: Wed, 15 Mar 2006 05:21:03 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: JoaoBR <joao@matik.com.br> Cc: freebsd-amd64@freebsd.org Subject: Re: amd64 slower than i386 on identical AMD 64 system? Message-ID: <20060315045807.F41988@delplex.bde.org> In-Reply-To: <200603131525.06540.joao@matik.com.br> References: <200603131525.06540.joao@matik.com.br>
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On Mon, 13 Mar 2006, JoaoBR wrote: > Since some time (>6.0R) I have the impression that amd64 runs slower than > i386. Now I run some tests on identical hardware and using ubench confirmes > this. Somebody has comments on this? Of course 64-bit mode is slower. Many (data) objects are twice as large, so there are more cache misses. 64-bit integer registers make relatively little difference except in code that does lots of 64-bit integer operations. Other features that are only available in 64-bit mode make relatively little difference except in even more specialized code. Bruce
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