Re: [PATCH 0/8] Optional ZONE_DMA V1
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- To: Jack Steiner <steiner@xxxxxxx>
- Subject: Re: [PATCH 0/8] Optional ZONE_DMA V1
- From: Christoph Lameter <clameter@xxxxxxx>
- Date: Wed, 13 Sep 2006 11:00:24 -0700 (PDT)
- Cc: Jes Sorensen <jes@xxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Marcelo Tosatti <marcelo@xxxxxxxxx>, Martin Bligh <mbligh@xxxxxxxxxx>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>
- In-reply-to: <20060913174948.GA6533@xxxxxxx>
- References: <20060911222729.4849.69497.sendpatchset@xxxxxxxxxxxxxxxxxxxxxxxxx> <1158046205.2992.1.camel@xxxxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0609121024290.11188@xxxxxxxxxxxxxxxxxxxxxxxxx> <yq0d5a0fbcj.fsf@xxxxxxxxxxxxxx> <Pine.LNX.4.64.0609130109030.15792@xxxxxxxxxxxxxxxxxxxxxxxxx> <4507D4EE.4060501@xxxxxxx> <Pine.LNX.4.64.0609131015360.17927@xxxxxxxxxxxxxxxxxxxxxxxxx> <20060913174948.GA6533@xxxxxxx>
On Wed, 13 Sep 2006, Jack Steiner wrote:
> - will any IA64 platform require that ZONE_DMA be enabled (I think
> the answer is "yes")
I think that still remains to be discussed. Today there are various means
to get around address restrictions.
> - if ZONE_DMA is enabled, ALTIX will still use only 1 zone. In your
> statement above, you say that disabling ZONE_DMA save 1M cpu
> structures. If ZONE_DMA is enabled, will these 1M structure be allocated
> on SN even though they are not needed?
That has always been the case. In SLES9 and SLES10 we are using 1/4th of the pagesets.
Having no ZONE_DMA provides additional benefits besides saving memory. The
VM balancing of allocations within a node becomes not necessary and
various VM optimization can be performed. Loops are unrolled. Less zones
have to be processed for draining / vm counter updates etc etc.
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