[Rene Herman - Wed, Dec 12, 2007 at 12:31:18AM +0100]
> 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.

| /* gcc -W -Wall -O2 -o port80 port80.c */
| 
| #include <stdlib.h>
| #include <stdio.h>
| 
| #include <sys/io.h>
| 
| #define LOOPS 10000
| 
| inline unsigned long long rdtsc(void)
| {
|       unsigned long long tsc;
| 
|       asm volatile ("rdtsc": "=A" (tsc));
| 
|       return tsc;
| }
| 
| inline void serialize(void)
| {
|       asm volatile ("cpuid": : : "eax", "ebx", "ecx", "edx");
| }
| 
| int main(void)
| {
|       unsigned long long start;
|       unsigned long long overhead; 
|       unsigned long long output;
|       unsigned long long input;
|       int i;
| 
|       if (iopl(3) < 0) {
|               perror("iopl");
|               return EXIT_FAILURE;
|       }
| 
|       asm volatile ("cli");
|       start = rdtsc();
|       for (i = 0; i < LOOPS; i++) {
|               serialize();    
|               serialize();
|       }
|       overhead = rdtsc() - start;
| 
|       start = rdtsc() + overhead;
|       for (i = 0; i < LOOPS; i++) {
|               serialize();
|               asm volatile ("outb %al, $0x80");
|               serialize();
|       }
|       output = rdtsc() - start;
| 
|       start = rdtsc() + overhead;
|       for (i = 0; i < LOOPS; i++) {
|               serialize();
|               asm volatile ("inb $0x80, %%al": : : "al");
|               serialize();
|       }
|       input = rdtsc() - start;
|       asm volatile ("sti");
| 
|       output /= LOOPS;
|       input  /= LOOPS;
|       printf("cycles: out %llu, in %llu\n", output, input);
| 
|       return EXIT_SUCCESS;
| }

Here we go (for 1000 times started) ;)

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---

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 36
model name      : AMD Turion(tm) 64 Mobile Technology ML-30
stepping        : 2
cpu MHz         : 800.000
cache size      : 1024 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 
3dnow pni lahf_lm ts fid vid ttp tm stc
bogomips        : 1601.04
clflush size    : 64

                Cyrill

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