9.2-BETA2 idle priorities messed up?

I have an i5-2500 machine running 9.2-BETA2 amd64 with the GENERIC kernel. Today, I updated my source tree and started building world with idprio 31 and I looked back a while later and all the CPU cores were essentially idle, and hardly any progress had been made on the build. I stopped and restarted the build without the idle priority setting and it ran fine. Anybody else seen any of this? Anybody know about a fairly recent scheduler change that might account for it?

I'm going to do a source upgrade to 9.2-RC1 to confirm...
 
It seems kind of weird on 9.2-RC1. Sometimes it blasts along, and at other times it seems to be almost idle (e.g. 97.8% idle and the disk is 1% busy).

My command line is: idprio 31 make buildworld -j4
 
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