linux-kernel - Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

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Message-Id: <20071112.144610.83838447.davem@davemloft.net>
Date:	Mon, 12 Nov 2007 14:46:10 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	tony.luck@...el.com, clameter@....com, herbert@...dor.apana.org.au,
	akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
 access overhead

From: Eric Dumazet <dada1@...mosbay.com>
Date: Mon, 12 Nov 2007 21:14:47 +0100

> I dont think this is a problem. Cpus numbers and ram size are related, even if 
> Moore didnt predicted it;
> 
> Nobody wants to ship/build a 4096 cpus machine with 256 MB of ram inside.
> Or call it a GPU and dont expect it to run linux :)
> 
> 99,9% of linux machines running on earth have less than 8 cpus and less than 
> 1000 ethernet/network devices.
> 
> In case we increase the number of cpus on a machine, the limiting factor is 
> the fact that cpus have to continually exchange on memory bus those highly 
> touched cache lines that contain refcounters or stats.

I totally agree with everything Eric is saying here.
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