Xref: utzoo comp.unix.i386:4130 comp.unix.xenix:11041 comp.music:1067
Path: utzoo!attcan!uunet!van-bc!ubc-cs!nebulus!root
From: root@nebulus.UUCP (Dennis S. Breckenridge)
Newsgroups: comp.unix.i386,comp.unix.xenix,comp.music
Subject: Re: UNIX Driver for Roland MPU-401-IPC
Message-ID: <1990Apr12.135812.1791@nebulus.UUCP>
Date: 12 Apr 90 13:58:12 GMT
References: <1990Apr11.112224.13861@nebulus.UUCP> <9533@cbnewsh.ATT.COM>
Organization: Alchemy Mindworks, Vancouver, Canada
Lines: 19

tjt@cbnewsh.ATT.COM (timothy.j.thompson) writes:

>What kind of system were you running it on?  On a 20Mhz 386 it keeps pretty
>good time for an arbitrarily long time, as long as the system has sufficient
>memory to prevent paging and is otherwise idle (e.g. uucico doesn't start up).

I have tried it on a AT&T 6386 16mhz, AT&T 6386E 20mhz, Consensys 386 25mhz.
It's more than a context switch that knocks the timing out. As it starts 
chewing up the CPU it gets less run time. I have tried it with a Caching
disk controller and did see an improvment. 
SysVR4 has a millitick function that times out at a kernel tick as opposed
to a process tick. This will give 1/100 of a second resolution. Your right
about trying to use it on stage. I too, wait for the SVR4 version, what you
have written so far is excellent!
-- 
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Dennis S. Breckenridge  (604) 277-7413   dennis@nebulus.uucp           VE7TCP
               EMACS: Eight Megabytes And Constantly Swapping!
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