On Wednesday 12 December 2007 00:31:18 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. > > Posted a previous incarnation of this before, buried in the outb 0x80 > thread which had a serialising problem. This one should as far as I can see > measure the right thing though. Please yell if you disagree... > > For me, on a Duron 1300 (AMD756 chipset) I have a constant: > > [EMAIL PROTECTED]:~/src/port80$ su -c ./port80 > cycles: out 2400, in 2400 > > and on a PII 400 (Intel 440BX chipset) a constant: > > [EMAIL PROTECTED]:~/src/port80$ su -c ./port80 > cycles: out 553, in 251 > > Results are (mostly) independent of compiler optimisation, but testing with > an -O2 compile should be most useful. Thanks! > > Rene.
Cyrix MII PR300 (225MHz), i430TX: cycles: out 263, in 93 Pentium MMX 166MHz @133MHz, VIA VPX: cycles: out 163, in 163 Celeron 433MHz, i440BX: cycles: out 620, in 305 Celeron 1.3GHz, i440BX: cycles: out 2114, in 849 Celeron 1.7GHz (P4-based), i845: cycles: out 2178, in 1651 Pentium 4 3.2GHz, i925X: cycles: out 2824, in 1899 Xeon E5310 1.6GHz, Dell PE1950 cycles: out 2631, in 1606 Xeon 3050 2.13GHz, Dell PE860 cycles: out 3367, in 1959 -- Ondrej Zary -- 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/
