netdev - Re: [PATCH net-next] net: allocate skbs on local node

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Date:	Tue, 12 Oct 2010 09:49:53 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Michael Chan <mchan@...adcom.com>,
	Eilon Greenstein <eilong@...adcom.com>,
	Christoph Hellwig <hch@....de>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH net-next] net:  allocate skbs on local node

Le mardi 12 octobre 2010 à 00:24 -0700, Andrew Morton a écrit :

> I'd love to forget it, but it's faster for some things (I forget
> which).  Which is why it's still around.

Yes, two years ago it was true on pathological/obscure cases.
Every time I did the comparison, SLUB won.
You asked me, I did yet another test this morning, and 40% is pretty
serious, I believe.

> 
> And the ghastly thing about this is that you're forced to care about it
> too because some people are, apparently, still using it.
> 

Yes, some people (in my company) still use linux 2.6.9 32bit on HP G6/G7
machines, I know...

I am not saying we should not care, but for any serious network workload
on NUMA arches, SLUB is the best, and seeing Christoph recent work, it
might even get better.

BTW, I believe all modern distros ship SLUB, dont they ?

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