[mythtv-users] Re: minimalist hardware for mythtv backend using
PVR-350 or PVR-250?
yanfali at best.com
Tue Oct 12 22:04:23 UTC 2004
Nice. An AMD/NatSemi Geode. Personally I would stay away. The
performance just running the linux kernel is abysmal. I have an old
Virgin Web Terminal with a similar CPU and it was slow as molasses. The
biggest issue with older slower CPUs is memory bandwidth, they simply
can't do as much because they can't get data in and out of the CPU fast
If you get it to work, more power too you. It's also not an 686 class
CPU. Last time I checked the optimal CPU configuration for it under
Linux kernel was a 586/pentium. This thing probably only supports MMX
at best, or possibly 3DNOW which means transcoding will be a nightmare.
One nice thing about having CPU to burn for the backend is you can use
it to transcode in the background, or commercial skip.
Also, remember if it only supports UDMA33 the PCI bus will be tied for
up 3 times as long as UDMA100 which might cause some unpredictable
behavior with your other PCI cards. When you get it up and running, try
hdparm -tT /dev/hda
and post the numbers. I'd be willing to bet they are very low. For
mpeg2 you only need to support 1MB/s max writes. So your PCI bus
shouldn't have to transfer more than 2-4MB/s. PCI32/33 can support
45-90MB/s comfortably. Of course if you want VGA and Audio support on
top of that, you might be asking a little much of the little fella. Let
us know how it works out.
Andrew Plumb wrote:
> Hi Tom,
> I picked mine up from EMJ Embeeded, now called WDL Systems:
> They aren't the cheapest thing out there, but they are tiny and I'm
> sure if you're going to manufacture something which uses thousands,
> you'll get a bigger price discount. :-)
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