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Date: Fri, 19 Feb 2010 17:10:25 -0800 (PST) From: David Miller <davem@...emloft.net> To: hancockrwd@...il.com Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, romieu@...zoreil.com Subject: Re: [PATCH 2.6.34] r8169: enable 64-bit DMA by default for PCI Express devices (v2) From: Robert Hancock <hancockrwd@...il.com> Date: Fri, 19 Feb 2010 19:00:46 -0600 > Currently use of 64-bit DMA is disabled in r8169 unless the user passes the > use_dac module option. This is reasonable for conventional PCI devices where > broken chipsets may not handle dual-address-cycle transfers properly for > 32-bit slots and so this may not be safe. However, PCI Express should not have > this problem and not using 64-bit DMA results in DMA transfers needlessly using > the IOMMU or SWIOTLB. Set the use_dac module parameter to a new default value of > -1 which results in 64-bit DMA being enabled by default for PCI Express devices > only. > > Signed-off-by: Robert Hancock <hancockrwd@...il.com> Applied, thanks Robert. -- 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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