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Message-ID: <4738AE04.1030506@cosmosbay.com>
Date: Mon, 12 Nov 2007 20:48:20 +0100
From: Eric Dumazet <dada1@...mosbay.com>
To: Christoph Lameter <clameter@....com>
CC: Herbert Xu <herbert@...dor.apana.org.au>,
David Miller <davem@...emloft.net>, 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
Christoph Lameter a écrit :
> On Mon, 12 Nov 2007, Herbert Xu wrote:
>
>> David Miller <davem@...emloft.net> wrote:
>>> Each IP compression tunnel instance does an alloc_percpu().
>> Actually all IPComp tunnels share one set of objects which are
>> allocated per-cpu. So only the first tunnel would do that.
>
> Ahh so the need to be able to expand per cpu memory storage on demand
> is not as critical as we thought.
>
Yes, but still desirable for future optimizations.
For example, I do think using a per cpu memory storage on net_device refcnt &
last_rx could give us some speedups.
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