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Message-ID: <47BE9781.3030304@zonnet.nl> Date: Fri, 22 Feb 2008 10:36:01 +0100 From: belcampo <belcampo@...net.nl> To: linux-kernel@...r.kernel.org Subject: Hyperthreading performance oddities Hi all, I would like to be personally CC'ed the answers/comments posted to the list in response to my posting. I have following CPU vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 1 cpu MHz : 3000.000 cache size : 1024 KB on 2.6.17 everything works as I expect. My Mandriva distribution standard has a 2.6.22.9 kernel which performed bad, numbers follow, installed a fresh 2.6.24.2 kernel also performed bad, so I installed 2.6.17 and everything works OK. I have some benchmarks from mplayer: Kernel 2.6.22.9 smp hyperthreading BENCHMARKs: VC: 334.042s VO: 0.053s A: 0.000s Sys: 4.049s = 338.143s Kernel 2.6.22.9 nonsmp/hyperthreading BENCHMARKs: VC: 262.008s VO: 0.031s A: 0.000s Sys: 3.528s = 265.567s with 2.6.17 kernel smp/hyperthreading pentium-pro as CPU BENCHMARKs: VC: 245.175s VO: 0.050s A: 0.000s Sys: 2.479s = 247.704s with 2.6.17 kernel smp/hyperthreading pentium4 optimized kernel BENCHMARKs: VC: 227.992s VO: 0.051s A: 0.000s Sys: 2.551s = 230.594s The 2.6.24.2 kernel had results as the 2.6.22.9 version Regards Henk Schoneveld -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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