[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 @
>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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