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From: Stefan Roese <sr@denx.de>
To: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] [PPC32] ADMA support for PPC 440SPe processors.
Date: Sat, 17 Mar 2007 19:43:27 +0100
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Cc: linux-raid@vger.kernel.org, Dan Williams <dan.j.williams@intel.com>
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On Saturday 17 March 2007 19:17, Dan Williams wrote:
> Yes, defaulting to 'y' is not necessary, but ASYNC_TX_DMA=y &&
> DMA_ENGINE=n is an explicit feature of the interface.  When DMA_ENGINE
> is not selected all the asynchronous paths in the API are compiled
> out.  This allows subsytems, like md-raid5, to be written in an
> asynchronous fashion without regard for the architecture[1] or
> availability of offload engines.

The current implementation builds on my embedded PPC4xx system without any 
disks the objects async_tx.o and xor.o into the kernel which I definitely 
don't need and want. And I get something like:

async_tx: api initialized (sync-only)
xor: measuring software checksumming speed
   8regs     :   145.000 MB/sec
   8regs_prefetch:   115.000 MB/sec
   32regs    :   176.000 MB/sec
   32regs_prefetch:   135.000 MB/sec
xor: using function: 32regs (176.000 MB/sec)

upon bootup.

Best regards,
Stefan