lkml.org 
[lkml]   [2007]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFT] Port 0x80 I/O speed
On Wed, Dec 12, 2007 at 01:57:01PM +0200, Ville Syrjälä wrote:
> On Wed, Dec 12, 2007 at 12:31:18AM +0100, 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.
>
> vendor_id : GenuineIntel
> cpu family : 6
> model : 15
> model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
> stepping : 6
>
> cpu MHz : 2394.000
> cycles: out 1830, in 1166
>
> cpu MHz : 1596.000
> cycles: out 1925, in 1266

BTW that was my home desktop. I just noticed that my work desktop gives out
significantly different results.

vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz
stepping : 6

cpu MHz : 2667.000
cycles: out 4263, in 2487

cpu MHz : 1600.000
cycles: out 4391, in 2623

There seems to be more variation in the results between runs on this system
too. I suppose the difference must be up to the chipset.

My home system:
00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev 02)
00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02)

My work system:
00:00.0 Host bridge: Intel Corporation 82975X Memory Controller Hub
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)

--
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-12-13 17:47    [from the cache]
©2003-2011 Jasper Spaans