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

From: "Jesper Juhl" <jesper.juhl@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 22:32:52 +0100	[thread overview]
Message-ID: <9a8748490712121332hc66c423w7c7ba353629a1004@mail.gmail.com> (raw)
In-Reply-To: <475F1DC6.5090403@keyaccess.nl>

On 12/12/2007, Rene Herman <rene.herman@gmail.com> 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.
>

root@dragon:/home/juhl# uname -a
Linux dragon 2.6.24-rc3-g2ffbb837 #7 SMP PREEMPT Mon Nov 19 22:16:27
CET 2007 i686 AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
AuthenticAMD GNU/Linux
root@dragon:/home/juhl# cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 35
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
stepping        : 2
cpu MHz         : 2200.000
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 ht syscall nx mmxext
fxsr_opt lm 3dnowext 3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips        : 4401.67
clflush size    : 64

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 35
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
stepping        : 2
cpu MHz         : 2200.000
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 ht syscall nx mmxext
fxsr_opt lm 3dnowext 3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips        : 4399.52
clflush size    : 64

root@dragon:/home/juhl# for i in $(seq 1 10); do ./port80 ; sleep 1 ; done
cycles: out 1839, in 1715
cycles: out 1728, in 1604
cycles: out 1762, in 1714
cycles: out 1770, in 1722
cycles: out 1759, in 1723
cycles: out 1764, in 1723
cycles: out 1762, in 1712
cycles: out 1761, in 1723
cycles: out 1771, in 1715
cycles: out 1770, in 1709


-- 
Jesper Juhl <jesper.juhl@gmail.com>
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