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Date: Thu, 13 Dec 2007 14:22:18 -0800 (PST) From: Christoph Lameter <clameter@....com> To: Ingo Molnar <mingo@...e.hu> cc: Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Christoph Hellwig <hch@...radead.org> Subject: Re: Major regression on hackbench with SLUB (more numbers) 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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