Linked by Thom Holwerda on Mon 19th Sep 2005 20:33 UTC
Windows In previous Windows releases, the entire audio stack ran in Kernel space. Vista will put an end to this. "The first (and biggest) change we made was to move the entire audio stack out of the kernel and into user mode. Pre-Vista, the audio stack lived in a bunch of different kernel mode device drivers, including sysaudio.sys, kmixer.sys, wdmaud.sys, redbook.sys, etc. In Vista and beyond, the only kernel mode drivers for audio are the actual audio drivers (and portcls.sys, the high level audio port driver)."
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RE[3]: BAD idea
by on Tue 20th Sep 2005 01:16 UTC in reply to "RE[2]: BAD idea"

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Never once did I reference anything that stated BeOS (or any other OS, for that matter) was the first to do it: I used BeOS as a great example of a system that not only has done what Vista is supposed to do, but blows other platforms (including Linux) out of the water with low latencies for sound.

That being said, it'll be interesting to see if Microsoft has changed things enough to make interrupt handling have less overhead than the last time I looked at writing device drivers, where the driver model included a lot of deferred procedure calls at different interrupt levels. In comparison, BeOS has a much simpler driver model, much closer to the typical Unix-ish driver model. Which model is better, and in which circumstances? Well... let's let reality make itself evident there ;)

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