[linux-audio-user] Re: [linux-audio-dev] [ANN] E-Radium V0.61b

From: Kjetil Svalastog Matheussen <k.s.matheussen@email-addr-hidden>
Date: Tue Jul 12 2005 - 23:35:24 EEST

Lee Revell <rlrevell@email-addr-hidden-job.com>

> On Tue, 2005-07-12 at 20:57 +0200, Kjetil Svalastog Matheussen wrote:
>> E-radium has been tested with both the 2.4 kernel and the 2.6 kernel
>> and with a ~1GhZ machine and a ~2ghz machine. (A 2.4 kernel with a
>> 100hz resolution timer will proably not work very nice though.)
> Can you please explain why 100HZ would be a problem for your app? Right
> now the kernel people are trying to change the default HZ for 2.6 to
> 250. I have told them that this is insane but they seem inclined to do
> it anyway.

The program use poll to sleep. If the resolution of the kernel is 100Hz,
would sometimes be a too long delay of up to 10ms (and probably beyond)
before the program is woken up, and before a midi message is sent,
which can cause music to stutter.

Simple as that. :-)

> If you can provide more examples of apps that would be broken by this
> change maybe we can convince them not to change it.

Hmm, mplayer I guess...
Don't know how muse, rosegarden, seq24 etc. handles timing...
But all midi-sequencers that doesn't use /dev/rtc could suffer. (?)
Received on Wed Jul 13 00:15:23 2005

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