Harondel J. Sibble wrote:
>
> On 25 Mar 2008 at 9:42, Roger Heflin wrote:
>
>> All of my latencies are set to 64, and I don't have any crashing of
>> the type that you describe (I have 2-150's and 1-atsc 5500), and a pci
>> 4 port sata card, and I don't get the unreasonably low latency error.
>
> If you set it 32, I bet you'll experience the same kind of problems,
> especially with multiple concurrent recordings.
>
>> I think those parameters are set by the bios (they are controllable in some
>> bioses), so it is likely a bios bug causing it.
>
> Oh? I've never seen that except on a few server motherboards.
>
> I wonder if that's something the VIA folks had added. Way back in the day
> like mid to late 90's, VIA based systems (running MS Windows 9x/NT) were
> actively recommended against for video capture and editing and I seem to
> remember the pci latency stuff being one of the major reasons. I do remember
> having to adjust the latency settings under windows 2000 to help with video
> capturing both for clients and my own usage.
I have seen it on server boards, but even if a board's bios does not allow you
to control it, it does not mean than the bios is not choosing how to set it,
and
maybe choosing incorrectly, the excuse the MB's companies bios use for not
putting an option that would be trivial to put in is usually that the customer
might use it and make their MB look bad because it was too slow because of the
option. It may have worked in their testing, or they may have not tested it,
or tested it with a very limited set of boards, I know I have dealt with a
number of server boards that I know they did not test very well the PCI-X slots
(primary PCI-e board), because if we used more than 1 PCI-X card under any set
of conditions it would not work at all (and this was several different boards).
They took the reference design and did not validate anything, in the end
they
gave us some bios settings to make the broken PCI-X stuff work, but it slowed
things down excessively (slowing down the PCI-X bus speed would not fix the
issue alone).
Roger
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