Date: Sat, 17 Jul 2010 19:17:03 -0300 From: Fabio Kaminski <fabiokaminski@gmail.com> To: freebsd-current@freebsd.org Subject: sensitive emt64 performance degradation over amd64 Message-ID: <AANLkTinOoDghQVdDOcShst8HE23ze-eUFagCe4rCChNN@mail.gmail.com>
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Hello list, im running two freebsd dists , each one in a diferent notebook.. i have a freebsd 8.1 rc2 running in amd64 with 2 cores 2MB mem.. (my old hp), and a freebsd 9-current running on a intel i3 (2 cores + 2 logical cores) with 4 MB ram.. and im was noting that the amd notebook was performing really fast compared to the i3.. even with for each core of i3 the clock been superior to the amd that i got here... i was looking to the kernel build and disable all the debug options from the 9 / kernel before the SMP option.. to see if it was the performance penalty cause... but that doesnt help to much... i didnt find any cpu flag to build the kernel specific to the intel arquitecture and leave the HAMMER option alone, knowing that emt64 and amd64 pretty the same thing... what could be happening... the biggest number of cores? .. or its a common thing... freebsd perform better on amd hardware... (note that i cant be too precise , since i didnt go any further with more tests... its more a subjective feel (boot time, general use.. etc)) Thanks, Fabio Kaminski
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