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Date: Sat, 22 Dec 2007 23:27:03 +0100 From: Bauke Jan Douma <bjdouma@...all.nl> To: Rene Herman <rene.herman@...il.com> CC: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: [RFT] Port 0x80 I/O speed Rene Herman wrote on 12-12-07 00:31: > Good day. > > Would some people on x86 (both 32 and 64) be kind enough to compile and > run the attached program? This is about testing how long I/O port access > to port 0x80 takes. It measures in CPU cycles so CPU speed is crucial in > reporting. Compiled as you wished. And here are the results from 10 iterations...: cycles: out 1965, in 1263 cycles: out 1968, in 1251 cycles: out 1957, in 1257 cycles: out 1992, in 1253 cycles: out 1959, in 1248 cycles: out 1965, in 1264 cycles: out 1957, in 1256 cycles: out 1959, in 1248 cycles: out 1962, in 1298 cycles: out 1962, in 1275 Linux skyscraper 2.6.23.11 #1 SMP Sun Dec 16 11:54:12 CET 2007 i686 GNU/Linux 32bits system processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU @ 2.40GHz stepping : 7 cpu MHz : 2400.182 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr s bogomips : 4802.73 clflush size : 64 processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU @ 2.40GHz stepping : 7 cpu MHz : 2400.182 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr s bogomips : 10614.49 clflush size : 64 processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU @ 2.40GHz stepping : 7 cpu MHz : 2400.182 cache size : 4096 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 4 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr s bogomips : 4800.17 clflush size : 64 processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU @ 2.40GHz stepping : 7 cpu MHz : 2400.182 cache size : 4096 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr s bogomips : 4800.17 clflush size : 64 -- 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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