From: "Török Edwin" <edwintorok@gmail.com>
To: Rene Herman <rene.herman@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
dpreed@reed.com, Alan Cox <alan@lxorguk.ukuu.org.uk>,
pavel@ucw.cz, andi@firstfloor.org, rol@as2917.net,
Krzysztof Halasa <khc@pm.waw.pl>,
david@davidnewall.com, hpa@zytor.com, john@stoffel.org,
linux-os@analogic.com
Subject: Re: [RFT] Port 0x80 I/O speed
Date: Wed, 12 Dec 2007 19:27:46 +0200 [thread overview]
Message-ID: <47601A12.2040103@gmail.com> (raw)
In-Reply-To: <475F1DC6.5090403@keyaccess.nl>
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...
>
Hi,
Tested on 2 systems.
System I
------------
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 47
model name : AMD Athlon(tm) 64 Processor 3200+
stepping : 2
cpu MHz : 2000.000
cache size : 512 KB
fpu : yes
fpu_exception : yes
Motherboard: Asus A9N-E
With -m32:
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 619, in 583
edwin@lightspeed2:~$ sudo ./port80
cycles: out 619, in 583
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
After making the __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
I get this with 64:
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
edwin@lightspeed2:~$ sudo ./port80
cycles: out 618, in 583
edwin@lightspeed2:~$ sudo ./port80
cycles: out 618, in 583
edwin@lightspeed2:~$ sudo ./port80
cycles: out 1107, in 1067
If I stop cpudyn I get a constant 618/583.
System II
------------
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2300 @ 1.66GHz
stepping : 8
cpu MHz : 1667.000
cache size : 2048 KB
physical id : 0
siblings : 2
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2300 @ 1.66GHz
stepping : 8
cpu MHz : 1667.000
cache size : 2048 KB
physical id : 0
siblings : 2
Dell Inspiron 6400, Intel Core Duo (ICH7 chipset)
thunder:/home/edwin# ./port80
cycles: out 2480, in 1867
thunder:/home/edwin# ./port80
cycles: out 2482, in 1865
thunder:/home/edwin# ./port80
cycles: out 2968, in 1893
thunder:/home/edwin# ./port80
cycles: out 1991, in 1372
thunder:/home/edwin# ./port80
cycles: out 1979, in 1366
thunder:/home/edwin# ./port80
cycles: out 2473, in 1865
thunder:/home/edwin# ./port80
cycles: out 2484, in 1869
After setting CPU governor to performance:
# ./port80
cycles: out 2368, in 1783
thunder:/home/edwin# ./port80
cycles: out 2377, in 1783
thunder:/home/edwin# ./port80
cycles: out 2367, in 1774
thunder:/home/edwin# ./port80
cycles: out 2370, in 1780
thunder:/home/edwin# ./port80
cycles: out 2365, in 1782
thunder:/home/edwin# ./port80
cycles: out 2369, in 1774
thunder:/home/edwin# ./port80
cycles: out 2366, in 1784
thunder:/home/edwin# ./port80
cycles: out 2379, in 1786
thunder:/home/edwin# ./port80
cycles: out 2367, in 1773
thunder:/home/edwin# ./port80
cycles: out 2376, in 1783
thunder:/home/edwin# ./port80
cycles: out 2360, in 1784
thunder:/home/edwin# ./port80
cycles: out 2367, in 1783
thunder:/home/edwin# ./port80
cycles: out 2370, in 1783
thunder:/home/edwin# ./port80
cycles: out 2382, in 1782
Also tried in a loop, but values are not constant:
while true; do ./port80; done
cycles: out 2415, in 1818
cycles: out 2405, in 1817
cycles: out 2414, in 1810
cycles: out 2411, in 1819
cycles: out 2407, in 1821
cycles: out 2410, in 1820
cycles: out 2418, in 1821
cycles: out 2408, in 1847
cycles: out 2404, in 1805
cycles: out 2411, in 1858
cycles: out 2395, in 1765
cycles: out 2377, in 1786
cycles: out 2378, in 1813
cycles: out 2395, in 1800
cycles: out 2381, in 1793
cycles: out 2382, in 1790
cycles: out 2399, in 1835
cycles: out 1928, in 1327
cycles: out 2410, in 1781
cycles: out 1996, in 1287
cycles: out 2369, in 1768
cycles: out 2401, in 1805
cycles: out 2395, in 1802
cycles: out 2389, in 1786
cycles: out 2359, in 1768
cycles: out 2495, in 1858
cycles: out 2408, in 1809
cycles: out 2919, in 1859
cycles: out 2404, in 1798
cycles: out 2393, in 1791
cycles: out 2882, in 1797
cycles: out 2404, in 1789
cycles: out 2406, in 1785
cycles: out 2393, in 1840
cycles: out 2498, in 1818
cycles: out 2402, in 1805
cycles: out 2888, in 1858
cycles: out 2397, in 1802
cycles: out 2411, in 1810
cycles: out 2396, in 1788
cycles: out 2362, in 1780
cycles: out 2861, in 1785
cycles: out 2380, in 1780
cycles: out 2357, in 1785
cycles: out 2342, in 1783
cycles: out 1916, in 1294
cycles: out 2358, in 1768
cycles: out 2371, in 1763
cycles: out 2386, in 1783
cycles: out 1919, in 1320
cycles: out 2355, in 1782
cycles: out 2330, in 1787
cycles: out 2350, in 1781
cycles: out 1881, in 1269
cycles: out 2378, in 1768
cycles: out 2381, in 1739
cycles: out 2365, in 1768
cycles: out 2362, in 1759
cycles: out 2368, in 1739
cycles: out 2354, in 1775
cycles: out 2375, in 1783
cycles: out 2369, in 1785
cycles: out 2361, in 1769
cycles: out 2382, in 1785
cycles: out 2370, in 1783
--Edwin
next prev parent reply other threads:[~2007-12-12 17:28 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
2007-12-12 17:27 ` Török Edwin [this message]
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
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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