current cvs works fine on NetBSD/i386 2.99.15. It even works on netbsd-2 (2.0_STABLE) on sparc64:
sparc64 gdt 37 ~/SOFTWARE/CODA/lwp > src/testlwp 1 1006 milliseconds for 1 MWaits (1006513.000000 usec per Mwait and Signal) sparc64 gdt 38 ~/SOFTWARE/CODA/lwp > src/testlwp 2 2015 milliseconds for 2 MWaits (1007717.000000 usec per Mwait and Signal) sparc64 gdt 39 ~/SOFTWARE/CODA/lwp > src/testlwp 3 3026 milliseconds for 3 MWaits (1008846.000000 usec per Mwait and Signal)
