Date: Thu, 16 Mar 2006 07:46:59 -0300 From: JoaoBR <joao@matik.com.br> To: Peter Wemm <peter@wemm.org> Cc: freebsd-amd64@freebsd.org Subject: Re: amd64 slower than i386 on identical AMD 64 system? / How is hyperthreading handled on amd64? Message-ID: <200603160747.00051.joao@matik.com.br> In-Reply-To: <200603151356.27972.peter@wemm.org> References: <20060313221836.5491916A420@hub.freebsd.org> <346a80220603141520i2ac1a4br66cbfb213453dcd6@mail.gmail.com> <200603151356.27972.peter@wemm.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wednesday 15 March 2006 18:56, Peter Wemm wrote: > I tend to agree with this. ubench is not a useful benchmark for > comparing 32 bit vs 64 bit systems. > > However, what might be interesting is to compile a 32 bit binary (and > statically link it) on the i386 system, and compare the runtime on the > 64 bit kernel, using the same identical binary. That way you are > measuring the same math operations on both platforms. Comparing 64 bit > operations vs 32 bit operations is apples vs oranges. > > Of course, it may still be slower, but at least the results would be > more meaningful. Don't assume the OS is slower because the compiler > makes the application do twice the work. good point=20 what do you think of unixbench since it does some real-life tasks? Jo=E3o A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200603160747.00051.joao>