Re: [RFT] Port 0x80 I/O speed

From: Cyrill Gorcunov
Date: Wed Dec 12 2007 - 11:59:23 EST

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[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:
>
> rene@7ixe4:~/src/port80$ su -c ./port80
> cycles: out 2400, in 2400
>
> and on a PII 400 (Intel 440BX chipset) a constant:
>
> rene@6bap:~/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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