netdev - Re: 2.6.24-rc2: Network commit causes SLUB performance regression with tbench

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Message-ID: <20071115011110.GB21193@gondor.apana.org.au>
Date:	Thu, 15 Nov 2007 09:11:10 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Christoph Lameter <clameter@....com>
Cc:	David Miller <davem@...emloft.net>, nickpiggin@...oo.com.au,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc2: Network commit causes SLUB performance regression with tbench

On Wed, Nov 14, 2007 at 05:03:25PM -0800, Christoph Lameter wrote:
> 
> Well this is likely the result of the SLUB regression. If you allocate an 
> order 1 page then the zone locks need to be taken. SLAB queues the a 
> couple of higher order pages and can so serve a couple of requests without 
> going into the page allocator whereas SLUB has to go directly to the page 
> allocator for allocate and free. I guess that needs fixing in the page 
> allocator. Or do I need to add a mechanism to buffer higher order page 
> allcoations to SLUB?

Actually this serves to discourage people from using high-order
allocations which IMHO is a good thing :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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