On Tue, 11 Dec 2007, Ingo Molnar wrote: > hackbench-10: 1.12 2.99 (166%) > hackbench-20: 2.04 6.67 (226%) > hackbench-50: 5.03 17.50 (247%) > > and hackbench overhead stands out, by a huge margin. Other stuff is > within measurement noise. Neither SLUB nor SLAB debugging was turned on, > all other debugging options were off too.
I just came back from vacation. The non linear growth of regression indicates lock contention somewhere. Must be something special that was triggered by hackbench. We have had a regression like that in 2.6.24 before due to order 1 allocs in the network layer. The .24 modifications for SLUB introduced page allocator pass through for allocations > PAGESIZE/2. Order 1 allocs could serialize on zone locks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
