Lerc at screamingduck.com
Tue Dec 23 00:27:03 EST 2008
On Mon, 2008-12-22 at 15:36 -0700, Jordan Crouse wrote:
> You might want to re-acquire the numbers with wireless turned off and
> the system in a very quiet state. If you want to be extra careful, you
> can run the benchmarks in an empty X server (no sugar) and save the
> results to a ramfs backed directory to avoid NAND.
The XO Numbers were recorded from a fairly inactive state. Wireless was
active but there shouldn't have been any traffic. I did launch X with
just an xterm, so sugar shouldn't be in play at all. I didn't think of
the speed of nand writes however.
> 2) The accel path requires reading from video memory (which is
> very slow)
I'm curious as to why reads from video memory are so slow, On standard
video cards it's slow because there is quite a division between the CPU
and the video memory, but on the geode isn't the video memory shared in
the same SDRAM as Main memory.
There's a separate 2 meg for DCON memory, but I was under the impression
that was just to remember the last frame.
Do I have that all wrong?
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