linux-kernel - Re: [PATCH] SLUB: revert direct page allocator pass through

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Message-ID: <alpine.DEB.1.10.0901231055520.32253@qirst.com>
Date:	Fri, 23 Jan 2009 10:57:10 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
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 Sat, 24 Jan 2009, Nick Piggin wrote:

> 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.

AFAICT it just wastes memory. My idea of a slab allocator is that it is
used for small (less than page sized) allocations. The page allocator
should be able to handle page sized allocations in an effective manner.

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