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Date: Wed, 13 Oct 2010 13:53:42 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Casey Dahlin <cdahlin@...hat.com> cc: linux-kernel@...r.kernel.org Subject: Re: A question about ZONE_DMA On Wed, 13 Oct 2010, Casey Dahlin wrote: > Hi all, > > So if I understand correctly, ZONE_DMA exists to separate and preserve the > chunk of memory to which older ISA cards are capable of doing DMA. The question > that arises for me is: > > 1) Why do /all/ 32-bit boxes have a ZONE_DMA when surely only a tiny and > shrinking number of them have a need for it? > If you don't need it, disable CONFIG_ZONE_DMA, which is useful to prevent oom conditions when lowmem_reserve_ratio reserves memory in that zone that you'll never need to save. If you do disable that option, you may also want to look at disabling CONFIG_GENERIC_ISA_DMA and CONFIG_ISA_DMA_API which you need to hack a little to get to compile. I'll send a patch to fix that. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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