[Rene Herman  Wed, Dec 12, 2007 at 12:31:18AM +0100]
Post by Rene HermanGood 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...
cycles: out 2400, in 2400
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 ML30
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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