When I ran # /usr/bin/time make during building glibc on a P4/HT machine with SMP kernel, I got make[1]: Leaving directory `/export/build/gnu/glibc/build-i686-linux' 20403.70user 3698.48system 16:13.95elapsed 2474%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (10128557major+8529726minor)pagefaults 0swaps RedHat 8.0 is ok: make[1]: Leaving directory `/export/build/gnu/glibc/build-i686-linux' 1286.58user 199.73system 14:56.90elapsed 165%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (10757363major+8583900minor)pagefaults 0swaps
The errata kernel seems ok.