Date: Sat, 19 Mar 2005 08:16:34 -0600
From: Matt Domsch <Matt_Domsch@dell.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: ak@suse.de, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 2.4.30-pre3] x86_64: pci_alloc_consistent() match 2.6 implementation
Message-ID: <20050319141634.GA17045@lists.us.dell.com>
References: <20050318212344.GC26112@lists.us.dell.com> <1111212585.6291.41.camel@laptopd505.fenrus.org>
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On Sat, Mar 19, 2005 at 07:09:45AM +0100, Arjan van de Ven wrote:
> On Fri, 2005-03-18 at 15:23 -0600, Matt Domsch wrote:
> > For review and comment.
> > 
> > On x86_64 systems with no IOMMU and with >4GB RAM (in fact, whenever
> > there are any pages mapped above 4GB), pci_alloc_consistent() falls
> > back to using ZONE_DMA for all allocations, even if the device's
> > dma_mask could have supported using memory from other zones.  Problems
> > can be seen when other ZONE_DMA users (SWIOTLB, scsi_malloc()) consume
> > all of ZONE_DMA, leaving none left for pci_alloc_consistent() use.
> 
> scsi_malloc no longer uses ZONE_DMA nowadays....

In 2.4.x it does.  scsi_resize_dma_pool() has:
      __get_free_pages(GFP_ATOMIC | GFP_DMA, 0);
scsi_init_minimal_dma_pool() has similar.


-- 
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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