On Wed, Dec 12, 2007 at 01:57:01PM +0200, Ville Syrjälä wrote: > On Wed, Dec 12, 2007 at 12:31:18AM +0100, Rene Herman wrote: > > 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. > > vendor_id : GenuineIntel > cpu family : 6 > model : 15 > model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz > stepping : 6 > > cpu MHz : 2394.000 > cycles: out 1830, in 1166 > > cpu MHz : 1596.000 > cycles: out 1925, in 1266
BTW that was my home desktop. I just noticed that my work desktop gives out significantly different results. vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz stepping : 6 cpu MHz : 2667.000 cycles: out 4263, in 2487 cpu MHz : 1600.000 cycles: out 4391, in 2623 There seems to be more variation in the results between runs on this system too. I suppose the difference must be up to the chipset. My home system: 00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev 02) 00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02) My work system: 00:00.0 Host bridge: Intel Corporation 82975X Memory Controller Hub 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01) -- Ville Syrjälä [EMAIL PROTECTED] http://www.sci.fi/~syrjala/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
