>From: Jeff Garzik [mailto:[email protected]]
>
>Andi Kleen wrote:
>> Index: linux-2.6.24-rc1-hack/arch/x86_64/Kconfig
>> ===================================================================
>> --- linux-2.6.24-rc1-hack.orig/arch/x86_64/Kconfig
>> +++ linux-2.6.24-rc1-hack/arch/x86_64/Kconfig
>> @@ -753,7 +753,6 @@ config PCI_DOMAINS
>> config DMAR
>> bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
>> depends on PCI_MSI && ACPI && EXPERIMENTAL
>> - default y
>> help
>> DMA remapping (DMAR) devices support enables
>independent address
>> translations for Direct Memory Access (DMA) from devices.
>
>ACK
>
>
>> Index: linux-2.6.24-rc1-hack/drivers/dma/Kconfig
>> ===================================================================
>> --- linux-2.6.24-rc1-hack.orig/drivers/dma/Kconfig
>> +++ linux-2.6.24-rc1-hack/drivers/dma/Kconfig
>> @@ -43,7 +43,6 @@ comment "DMA Clients"
>> config NET_DMA
>> bool "Network: TCP receive copy offload"
>> depends on DMA_ENGINE && NET
>> - default y
>> help
>> This enables the use of DMA engines in the network stack to
>> offload receive copy-to-user operations, freeing CPU cycles.
>
>ACK -- but its arguable that given the current code, its worth setting
>this if DMA_ENGINE is also set.
>
The intent is to give us a DMA offload for NIC-to-user operations. At
the moment the ioatdma device is the only gizmo supporting this through
NET_DMA, and is the only DMA_ENGINE supported on x86. As more devices
are made available through DMA_ENGINE on platforms that don't have
ioatdma, removing the "default y" makes sense. I agree that this is
ACK-able, but under the "it should just work" philosophy, and with the
Intel servers coming out with the hardware support, it may want to wait
until there are more DMA_ENGINE choices.
In any case, I'll ACK this and let the maintainers decide on the timing.
sln
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