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

Kjetil Svalastog Matheussen <k.s.matheussen@notam02.no> k.s.matheussen at notam02.no
Tue Jul 12 16:35:24 EDT 2005


Lee Revell <rlrevell at joe-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,
there
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. (?)







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