linux-kernel - RE: [PATCH 1/3] slub: set a criteria for slub node partial adding

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Message-ID: <alpine.DEB.2.00.1112131835100.31514@chino.kir.corp.google.com>
Date:	Tue, 13 Dec 2011 18:36:53 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	"Shi, Alex" <alex.shi@...el.com>
cc:	Christoph Lameter <cl@...ux.com>,
	"penberg@...nel.org" <penberg@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: RE: [PATCH 1/3] slub: set a criteria for slub node partial adding

On Tue, 13 Dec 2011, David Rientjes wrote:

> > > 	{
> > > 	        n->nr_partial++;
> > > 	-       if (tail == DEACTIVATE_TO_TAIL)
> > > 	-               list_add_tail(&page->lru, &n->partial);
> > > 	-       else
> > > 	-               list_add(&page->lru, &n->partial);
> > > 	+       list_add_tail(&page->lru, &n->partial);
> > > 	}
> > > 

2 machines (one netserver, one netperf) both with 16 cores, 64GB memory 
with netperf-2.4.5 comparing Linus' -git with and without this patch:

	threads		SLUB		SLUB+patch
	 16		116614		117213 (+0.5%)
	 32		216436		215065 (-0.6%)
	 48		299991		299399 (-0.2%)
	 64		373753		374617 (+0.2%)
	 80		435688		435765 (UNCH)
	 96		494630		496590 (+0.4%)
	112		546766		546259 (-0.1%)

This suggests the difference is within the noise, so this patch neither 
helps nor hurts netperf on my setup, as expected.
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