scheduling priority not working?

[Zhang Weiwu]

Hello. I thought scheduling priority is the kind of absolute priority, that 
is only when the higher priority process don't ask for resource, can the 
lower priority process gets resource. If the higher priority process sucks, 
the lower priority process starvs.

Now I have a old Pentium-mmx 166 box, running mpg321 fine. I wish to listen 
to music when recompile the kernel, so turn on the music, do:
#nice make;
I thought "nice make" use the resouce mpg321 left to it, but actually the 
music process is seriously disturbed, it begins to sound like .... 
terrible.

So I don't realy understand the scheduling priority mechnism in FreeBSD?

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