linux-kernel - Re: [RFC][PATCH 6/7] mm: slub: remove 'struct page' alignment restrictions

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Message-ID: <20131214031356.GS22695@tassilo.jf.intel.com>
Date:	Fri, 13 Dec 2013 19:13:56 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Pravin B Shelar <pshelar@...ira.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC][PATCH 6/7] mm: slub: remove 'struct page' alignment
 restrictions

> helps performance, presumably because of that 14% fewer
> cacheline effect.  A 30GB dd to a ramfs file:
> 
> 	dd if=/dev/zero of=bigfile bs=$((1<<30)) count=30
> 
> is sped up by about 4.4% in my testing.

Impressive result!

-Andi
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