Re: I/O latency in Tiger
Re: I/O latency in Tiger
- Subject: Re: I/O latency in Tiger
- From: William Stewart <email@hidden>
- Date: Fri, 15 Apr 2005 14:35:22 -0700
The Apple pages actually do not discriminate between Tiger or other
versions of Mac OS X, but are rather referring to general features
provided by Core Audio.
There have been numerous discussions on this topic on this list and
elsewhere, so lets not reiterate those again. In terms of a credible
comparison between different OS and Driver models, probably the most
reliable, repeatable figures are from a study of about 4 years ago.
Audio Latency Measurements of Desktop Operating Sytsems by
Karl MacMillan, Michael Droettboom, Ichiro Fujinaga
Peabody Institute of the Johns Hopkins University
email: {karlmac,mdboom,ich}@peabody.jhu.edu
You can google this to download the article. As far as I am aware the
general figures reported by this study are still basically correct.
It was done before there were any 3rd party Audio cards supported on
Mac OS X, so built-in audio was used.
As with ASIO and other systems, both the characteristics of the
driver, the transport type (USB/FW/PCI), characteristics of the
hardware itself, all affect the actual results you can obtain for a
given set up. The article does do a good job I believe in describing
in general terms the possibilities with the different configurations
and OS or API services.
Bill
On 15/04/2005, at 1:27 PM, Frank Vernon wrote:
Hi-
Apologies in advance if this has been covered before but I couldn't
find a
definitive answer in the mailing list archives.
I read in the Tiger marketing materials Apple is claiming "ultra-low
latency" for CoreAudio in Tiger. I can find no technical
specifications to
support this claim however. Is there anyone here who can clarify
exactly
what are the I/O latency characteristics of CoreAudio in Tiger and how
they are calculated? Can anyone point me to documentation on this
topic?
Thanks-
Frank Vernon
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