Subject: Re: [linux-audio-dev] audio app timing architectures
From: rob (rob_AT_kaybee.org)
Date: pe elo 06 1999 - 09:01:26 EDT
hi,
most x86 platforms have a real time clock in LSI, which can be set
to 1024Hz without affecting most other drivers. adding the enhanced
support for /dev/rtc will give you access to it.
i used this method of timing in a userland sequencer i was messing
with and had good success with it even under varying cpu.
rob
On Fri, 6 Aug 1999 est_AT_hyperreal.org wrote:
> However, currently, linux on x86 has a timer interrupt at 100 hz.
> This is too coarse to allow the above strategy *and* have
> low-latencies/high-responsiveness. Something more like 1024 hz timer
> interrupts would be more practical. Switching to that is as easy as
> changing the definition of HZ in the kernel, however, their are issues
> with that. Some user-space apps that assume HZ=100 would need to be
---
Rob Melby
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp: ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt4255a
Internet: rob_AT_kaybee.org, gt4255a_AT_prism.gatech.edu
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