Re: MOTU Fastlane MIDI driver wastes 10-25% CPU
Re: MOTU Fastlane MIDI driver wastes 10-25% CPU
- Subject: Re: MOTU Fastlane MIDI driver wastes 10-25% CPU
- From: Shaun Wexler <email@hidden>
- Date: Thu, 07 Nov 2002 17:23:46 -0800
On 11/7/02 4:41 PM, "Doug Wyatt" <email@hidden> wrote:
>
With no MIDI going in or out, the MIDIServer wakes about once a second
>
(long story) to do next to no work. top reports 0% CPU usage. With
>
the USB class driver, one incoming full-bandwidth MIDI stream can cause
>
occasional peaks of about 15%.
MIDIServer has 15% sustained average CPU use, with NO I/O on any MIDI
stream. It has no noticeable latency when receiving external MIDI packets
thru the interface, but I haven't tried to measure actual (why bother?)...
>
I suspect the FastLane may be using isoc transfer mode, whereas most
>
other devices use bulk...
Yes, Shikari confirms it.
This universal MOTU driver apparently supports all their current USB-to-MIDI
interfaces. Are any other people experiencing this blocking behavior using
different devices? I'm going to experiment further with the driver on 6F21.
--
Shaun Wexler
http://www.macfoh.com
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