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: Kurt Revis <email@hidden>
- Date: Thu, 7 Nov 2002 23:23:06 -0800
On Thursday, November 7, 2002, at 05:23 PM, Shaun Wexler wrote:
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.
I'm not seeing this exact behavior. I have the MOTU driver installed
(version 1.0.0), with a FastLane USB plugged in. Audio MIDI Setup is
open, on the "MIDI Devices" tab. No other MIDI apps are running and no
MIDI I/O is happening. top indicates that the MIDIServer is using 0.0%
CPU.
What I DO get are periodic spikes where the CPU usage goes up to 100%
for no apparent reason. This goes on for around fifteen seconds, and
happens every few minutes (it's happened 3 or 4 times while I've been
writing this). The MIDIServer's CPU usage bounces around between 50%
and 100%; most of this is shown as system time, not user.
How exactly are you measuring 15%?
Anyway, this looks scary, but other processes still seem responsive
while the spikes are happening, so I'm not as worried as I probably
should be. I'd still like to see it fixed.
FWIW, I also have a MIDIMAN 2x2 interface, and I'm not seeing any
problems like this using the latest driver for it.
--
Kurt Revis
email@hidden
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