> > So, you will just have to try and see! Make sure your harddrives can
> > sustain > 25MB/s (a little overhead for seeks, etc.), install the rawio
> > patches for the kernel, write a capture driver that can use rawio to
> > capture to a raw partition on the HDD without too much kernel overhead,
> > get a motherboard with really low latency PCI arbitration, and hope...
>
> Wow. That's a bit complicated, now, isn't it? :) You couldn't use rawio on a
>software raid0, though, could you?
I don't think so. I suppose if your CPU is fast enough you could get
away without rawio - the CPU is probably the strongest link in the chan
these days.
> > Sorry, in the end I haven't really answered your question. In theory it
> > is definitely possible, but I have a horrible suspision that the
> > arbitration latency on the PCI bus is going to keep theory from
> > becomming practice...
>
> This is a bit off topic, but I've seen the Asus K7V (VIA KT133)
> consistently score perfect 500MB/sec of memory-to-cpu bandwidth. Can
> anyone vouch for the PCI latency with this chipset?
I don't know about the KT133, but the KX133 had the worst latencies I've
seen since Intel's first PCI 2.1 chipset (can't remember what it was
called). The KT133 seems a bit better though. A simple test would be
to capture to ram, and then copy directly to the video framebuffer.
This should simulate the PCI load of capture->ram->hdd.
-justin
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