Re: hdd & sound

Roger Larsson (roger.larsson@skelleftea.mail.telia.com)
Tue, 17 Aug 1999 23:24:14 +0200


Hi all,

Lets make some definitions.

pitch problem (sounds analogue)
- (Wakkos) the sound changes pitch when hard disk is
accessed.

hack problem (sounds digital)
- the sound drops out for short intervals since the sound
generating program do not get. Digital effect.
- time from waking of a higher priority process
to it gets CPU to keep the output buffer filled.
This can be somewhat avoided by sound application
writers by using ridiculous huge output buffers.
[ongoing work in this area is described on
http://www.gardena.net/benno/linux/audio/
Ingo Molnar is involved.
Latest version (N6+) < 5 ms ...
]
- enough IO to keep the input buffer filled.
[you would probably need something like the
described in thread "Prioritized IO", but you
need to fix the CPU problem first... ]

stuck problem (sounds digital)
- (mine when trying to reproduce the pitch problem) after
several repeated runs of a process that stress disk write
the sound gets stuck in some strange output.
[Working with Alan to find this]

So, where does your fit?

/RogerL

-- 

The Internet interprets Windows as damage, and routes around it.

Roger Larsson Skellefteċ Sweden

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