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Date: Wed, 17 Jun 2009 08:58:19 +0100 From: Chris Pringle <chris.pringle@...el.com> To: Scott Wood <scottwood@...escale.com> CC: linux-kernel@...r.kernel.org, "linuxppc-dev@...abs.org list" <linuxppc-dev@...ts.ozlabs.org> Subject: Re: PowerPC PCI DMA issues (prefetch/coherency?) > You could enable CONFIG_NOT_COHERENT_CACHE. > I've just tried this (I had to edit Kconfig in power/platforms to make the build system accept it), and interestingly it's making no difference. I'm using streaming mappings, and are using the pci_map_sg functions to ensure the memory is mapped/flushed correctly. I've also explicitly put in a pci_dma_sync_sg_for_device, however that's also not made any difference. Turning the cpu cache snoop off has the same affect as it did without CONFIG_NOT_COHERENT_CACHE; it gets much worse. Any other ideas? Will back off the low latency patches next, and give 2.6.30 a try - see if that makes any difference. -- ______________________________ Chris Pringle Software Engineer Miranda Technologies Ltd. Hithercroft Road Wallingford Oxfordshire OX10 9DG UK Tel. +44 1491 820206 Fax. +44 1491 820001 www.miranda.com ____________________________ Miranda Technologies Limited Registered in England and Wales CN 02017053 Registered Office: James House, Mere Park, Dedmere Road, Marlow, Bucks, SL7 1FJ -- 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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