On Wednesday 12 December 2007 01:31:18 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. >
Sure, [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1767, in 1147 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1774, in 1148 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1769, in 1150 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1769, in 1150 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1777, in 1150 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1766, in 1149 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1768, in 1148 [EMAIL PROTECTED]:~/tmp$ sudo ./port800 cycles: out 1765, in 1147 Core 2 Duo system (ICH8/Intel DG965RY motherboard) -- 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/
