[wdmaudiodev] Re: Windows and PCIe
- From: Tim Roberts <timr@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 16 Feb 2006 09:20:54 -0800
mikko.helin@xxxxxxxxxx wrote:
>The PCIe FAQ document @
>http://www.microsoft.com/whdc/system/bus/pci/PCIe_FAQ.mspx
>tells that Quality of service (VC/TC and isochronous support)is not supported
>on any Windows version. Why has that been decided?
>
Because most of that whole section of the PCI-Express standard is
specified as "optional". That means the operating system cannot rely on
its presence, so there will never be enough real-world testing to make
the support reliable.
As I understand it, the PCIe authors now regret having added it at all,
and there is talk of removing it.
>How it can be garanteed that a sound card at PCI bus behind the PCIe-PCI
>bridge gets the high enough priority what is needs for low-latency performance?
>
How would that particular case have been helped? Would you give that
entire PCI bus a higher priority?
Wouldn't it be better to argue for a native PCI-Express audio card?
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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