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SubjectRe: [RFC][PATCH 000 of 3] MD Acceleration and the ADMA interface: Introduction
Dan Williams wrote:
> This patch set was originally posted to linux-raid, Neil suggested that
> I send to linux-kernel as well:
> Per the discussion in this thread (
> t=112603120100004&r=1&w=2) these patches implement the first phase of MD
> acceleration, pre-emptible xor. To date these patches only cover raid5
> calls to compute_parity for read/modify and reconstruct writes. The
> plan is to expand this to cover raid5 check parity, raid5 compute block,
> as well as the raid6 equivalents.
> The ADMA (Asynchronous / Application Specific DMA) interface is proposed
> as a cross platform mechanism for supporting system CPU offload engines.
> The goal is to provide a unified asynchronous interface to support
> memory copies, block xor, block pattern setting, block compare, CRC
> calculation, cryptography etc. The ADMA interface should support a PIO
> fallback mode allowing a given ADMA engine implementation to use the
> system CPU for operations without a hardware accelerated backend. In
> other words a client coded to the ADMA interface transparently receives
> hardware acceleration for its operations depending on the features of
> the underlying platform.

Here are some other things out there worth considering:

* SCSI XOR commands

* Figuring out how to support Promise SX4 (e.g. device offload), which
is a chip with integrated XOR engine and attached DIMM. RAID1 and RAID5
are best implemented on-card, but the Linux driver is responsible for
implementing all on-card actions, not a firmware.


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