linux-kernel - Re: [QUICKLIST 0/6] Arch independent quicklists V1

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Message-Id: <20070315002249.9e531578.akpm@linux-foundation.org>
Date:	Thu, 15 Mar 2007 00:22:49 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	paulus@...ba.org, clameter@....com, linux-kernel@...r.kernel.org,
	ak@...e.com, holt@....com, linux-ia64@...r.kernel.org,
	mpm@...enic.com
Subject: Re: [QUICKLIST 0/6] Arch independent quicklists V1

> On Mon, 12 Mar 2007 19:32:11 -0700 (PDT) David Miller <davem@...emloft.net> wrote:
> From: David Miller <davem@...emloft.net>
> Date: Mon, 12 Mar 2007 19:26:16 -0700 (PDT)
> 
> > From: Paul Mackerras <paulus@...ba.org>
> > Date: Tue, 13 Mar 2007 11:37:32 +1100
> > 
> > > David Miller writes:
> > > 
> > > > I ported this to sparc64 as per the patch below, tested on
> > > > UP SunBlade1500 and 24 cpu Niagara T1000.
> > > 
> > > Did you see any performance improvement?  We used to have quicklists
> > > on ppc, but I remain to be convinced that they actually help.
> > 
> > It shaved about 3 or 4 seconds consistently off of my kernel
> > build on Niagara which usually clocks in just over 4 minutes
> > on this 24 thread machine.
> 
> I want to quantify this with the fact that all the cache false sharing
> issues are irrelevant in this test because the L2 cache is shared
> between all of the cpu threads on Niagara.
> 
> It was fast just because the quicklists were lighter weight than the
> SLAB stuff.

So...  what would happen if sparc64 were to use neither quicklists nor
slab?  Just grab these pages from the page allocator and clear them?

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