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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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