Messages in this thread | | | Date | Wed, 22 Aug 2007 09:44:32 +0200 | From | Jes Sorensen <> | Subject | Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64 |
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Matthew Wilcox wrote: > So, let me try to understand ... your hardware allows writes from the > device to pass other writes from the device? Doesn't that violate the > PCI spec? I'm thinking about this (page 43 of PCI 2.3):
Hi Matthew,
Yes I believe this behavior on sn2 is 'bending' the PCI spec a bit. The problem is that the NUMA fabric is a routed network in itself so there can be multiple paths between the device and the physical memory it DMAs to/from.
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