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Date: Sat, 24 Jan 2009 02:37:09 +1100 From: Nick Piggin <nickpiggin@...oo.com.au> To: Christoph Lameter <cl@...ux-foundation.org> Cc: Pekka J Enberg <penberg@...helsinki.fi>, yanmin_zhang@...ux.intel.com, Andi Kleen <andi@...stfloor.org>, Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org Subject: Re: [PATCH] SLUB: revert direct page allocator pass through On Saturday 24 January 2009 02:27:29 Christoph Lameter wrote: > On Sat, 24 Jan 2009, Nick Piggin wrote: > > > I thought higher order allocations were not supposed to be used in > > > performance critical paths? > > > > ? You use them all the time in SLUB alone. > > But SLUB compensates for the slow higher order allocs by using them as > buffers for smaller objects.. The higher order allocs are in the slow > paths. I don't quite know what you're asking of me. If you see higher order allocations in performance critical code, then you answer your own question? However, I don't know if netperf udp 4K over loopback is totally realistic. Maybe real network drivers have different allocation patterns. If I were you I wouldn't be too hasty to make big changes based on that alone, if it could introduce regression in somewhere more important. -- 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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