linux-kernel - Re: No, really, stop trying to delete slab until you've finished making slub perform as well

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Date:	Mon, 4 Aug 2008 20:20:08 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <cl@...ux-foundation.org>
Cc:	"KOSAKI Motohiro" <m-kosaki@...es.dti.ne.jp>,
	"Matthew Wilcox" <matthew@....cx>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Mel Gorman" <mel@...net.ie>, andi@...stfloor.org,
	"Rik van Riel" <riel@...hat.com>, kosaki.motohiro@...fujitsu.com
Subject: Re: No, really, stop trying to delete slab until you've finished making slub perform as well

On Mon, Aug 4, 2008 at 8:13 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> KOSAKI Motohiro wrote:
>
>> When hackbench running, SLUB consume memory very largely than SLAB.
>> then, SLAB often outperform SLUB in memory stavation state.
>>
>> I don't know why memory comsumption different.
>> Anyone know it?
>
> Can you quantify the difference?
>
> SLAB buffers objects in its queues. SLUB does rely more on the page allocator.
> So SLAB may have its own reserves to fall back on.

Also, what kind of machine are we talking about here? If there are a
lot of CPUs, SLUB will allocate higher order pages more aggressively
than SLAB by default.
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