From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Rene Herman <rene.herman@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFT] Port 0x80 I/O speed
Date: Wed, 12 Dec 2007 19:59:03 +0300 [thread overview]
Message-ID: <20071212165903.GA7727@cvg.cvg> (raw)
In-Reply-To: <475F1DC6.5090403@keyaccess.nl>
[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
next prev parent reply other threads:[~2007-12-12 16:59 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-11 23:31 [RFT] Port 0x80 I/O speed Rene Herman
2007-12-11 23:40 ` Maxim Levitsky
2007-12-11 23:44 ` Rene Herman
2007-12-12 0:14 ` Maxim Levitsky
2007-12-12 0:27 ` Rene Herman
2007-12-11 23:43 ` Alejandro Riveira Fernández
2007-12-11 23:51 ` Rene Herman
2007-12-12 0:09 ` Alejandro Riveira Fernández
2007-12-12 0:16 ` Rene Herman
2007-12-12 11:43 ` Alejandro Riveira Fernández
2007-12-12 21:02 ` H. Peter Anvin
[not found] ` <Pine.LNX.4.61.0712120753210.4443@chaos.analogic.com>
2007-12-12 13:20 ` Rene Herman
2007-12-12 13:23 ` linux-os (Dick Johnson)
2007-12-11 23:55 ` Nigel Cunningham
2007-12-12 0:01 ` Rene Herman
2007-12-12 2:07 ` Nigel Cunningham
2007-12-12 1:19 ` Alistair John Strachan
2007-12-12 1:28 ` Randy Dunlap
2007-12-12 1:40 ` Mike Lampard
2007-12-12 5:23 ` Kyle McMartin
2007-12-12 7:18 ` Rene Herman
2007-12-13 2:41 ` H. Peter Anvin
2007-12-12 19:25 ` H. Peter Anvin
2007-12-12 19:32 ` Andi Kleen
2007-12-12 19:43 ` H. Peter Anvin
2007-12-12 8:17 ` Paolo Ornati
2007-12-12 8:38 ` Edwin de Caluwé
2007-12-12 8:35 ` Dave Young
2007-12-12 8:48 ` Jiri Slaby
2007-12-12 11:25 ` Jiri Slaby
2007-12-12 15:50 ` Rene Herman
2007-12-12 15:53 ` Rene Herman
2007-12-12 18:44 ` H. Peter Anvin
2007-12-12 19:19 ` Rene Herman
2007-12-13 15:19 ` Jiri Slaby
2007-12-12 8:59 ` Juergen Beisert
2007-12-12 14:30 ` Rene Herman
2007-12-12 15:12 ` Juergen Beisert
2007-12-12 9:55 ` Luciano Rocha
2007-12-12 9:57 ` Romano Giannetti
2007-12-12 16:27 ` Rene Herman
2007-12-12 10:28 ` Peter Zijlstra
2007-12-12 10:34 ` Dave Haywood
2007-12-12 11:57 ` Ville Syrjälä
2007-12-13 16:42 ` Ville Syrjälä
2007-12-12 16:16 ` John Stoffel
2007-12-12 16:39 ` Olivér Pintér
2007-12-12 16:53 ` Ondrej Zary
2007-12-12 17:00 ` H. Peter Anvin
2007-12-12 16:59 ` Cyrill Gorcunov [this message]
2007-12-12 17:27 ` Török Edwin
2007-12-12 18:54 ` David P. Reed
2007-12-12 18:39 ` SL Baur
2007-12-12 19:06 ` Rene Herman
2007-12-12 21:32 ` Jesper Juhl
2007-12-12 23:54 ` Jan Engelhardt
2007-12-13 0:13 ` Jan Engelhardt
2007-12-13 2:06 ` H. Peter Anvin
2007-12-22 22:27 ` Bauke Jan Douma
-- strict thread matches above, loose matches on Subject: below --
2007-12-12 5:06 Chris Holvenstot
2007-12-12 11:20 linux
2007-12-12 12:35 ` Paolo Ornati
2007-12-12 14:48 ` Rene Herman
[not found] <9zmRR-3pA-25@gated-at.bofh.it>
2007-12-13 16:27 ` James Kosin
2007-12-13 22:07 ` Rene Herman
2007-12-13 22:30 ` Jesper Juhl
2007-12-13 22:37 ` Rene Herman
[not found] <9A0cz-7xy-13@gated-at.bofh.it>
[not found] ` <9A0cz-7xy-11@gated-at.bofh.it>
[not found] ` <9A4pU-69z-15@gated-at.bofh.it>
2007-12-14 14:08 ` James Kosin
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