[wdmaudiodev] Re: setting sample rate in the control panel in Vista
- From: Hakon Strande <hakons@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 2 Nov 2007 10:06:28 -0700
David,
On the audio side we counted 17 values and 2 keys per device endpoint,
let's round it up to 20. :-)
So 32 devices creates around 640 registry keys/values in audio alone.
There may be a furious storm of registry reads/writes on the PNP side
too - we are not sure how much, the PnP team would have to be consulted.
Also, a device install causes us to use SetupDi which will certainly
cause more registry reads to happen as we traverse the device topology
introduced by the new device arrival.
15000 seems a little high to me though... is this a REAL or theoretical
problem at this point?
You can inspect this further by using process monitor during PnP
install.
http://www.microsoft.com/technet/sysinternals/utilities/processmonitor.m
spx
Sincerely,
Hakon Strande | Windows Sound Team PM
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David A. Hoatson
Sent: Thursday, November 01, 2007 9:27 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: setting sample rate in the control panel in
Vista
> It may help you to install different devices for each format and
disable
> the unused formats, so that the format for each device never changes.
But
> I personally did not like that approach and havent tried that.
> For the MADI card that would mean for example:
>
> 64 channels x 8 different formats x 9 samplerates = 4608 subdevices
to
> install.
Is it still true that each device that is installed will setoff a
registry
access storm that will touch the registry some 15000 times per device?
Under XP, we measured an install at around 30 seconds worth of registry
access for our hardware with 32 devices. We finally changed our
firmware
so it will not show 32 devices (even though our hardware can do that)
because the delay was unusable.
With the sample rate problem on Vista, having to create all these extra
"phantom" devices seems like that would make the registry access problem
much worse.
Thank you,
David A. Hoatson
Lynx Studio Technology, Inc.
www.lynxstudio.com
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