> [ 0.404369] x86: Booting SMP configuration: ... > [ 2.737884] x86: Booted up 4 nodes, 120 CPUs > [ 2.743758] smpboot: Total of 120 processors activated (671097.18 BogoMIPS) > > (2.743758-0.404369) = 2.339389 for all 119 processors > /119 = .01965873109243697478 - lets call it 19ms each
For the record, the same (bare metal) box running latest tip boots 10ms/processor quicker than upstream Linux, as expected. So this 120 processor box now boots 1.19 seconds faster, in total. [ 0.415969] x86: Booting SMP configuration: ... [ 1.553658] x86: Booted up 4 nodes, 120 CPUs [ 1.559173] smpboot: Total of 120 processors activated (671182.14 BogoMIPS) 1.553658-0.415969 = 1.137689 - seconds to bring 119 processors on-line. ./119 = .00956041176470588235 -- 9.5ms per processor, down from 19. BTW. this time can be reduced by 7% (113 ms) by deleting announce_cpu(): [ 1.445815] x86: Booted up 4 nodes, 120 CPUs cheers, Len Brown, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
