On Fri, 11 Oct 2013 15:20:32 -0500 xxiao <xiaoxianghua@xxxxxxxxx> wrote: > I'm looking for ways to speed up RAID calculations(e.g XOR for RAID5) plus > offloading them from CPU as much as possible. During kernel boot up I > noticed two outputs: > > crypto/xor.c: > xor: measuring software checksum speed > 8regs : 3379.000 MB/sec > 8regs_prefetch: 2969.000 MB/sec > 32regs : 3398.000 MB/sec > 32regs_prefetch: 3054.000 MB/sec > xor: using function: 32regs (3398.000 MB/sec) > > lib/raid6: > raid6: altivecx1 1470 MB/s > raid6: altivecx2 1820 MB/s > raid6: altivecx4 2756 MB/s > raid6: altivecx8 2874 MB/s > raid6: int64x1 480 MB/s > raid6: int64x2 832 MB/s > raid6: int64x4 1221 MB/s > raid6: int64x8 1160 MB/s > raid6: using algorithm altivecx8 (2874 MB/s) > raid6: using intx1 recovery algorithm > > However I'm unclear how the md drivers(especially RAID5, and/or RAID6) can > benefit from these code, can I use them to accelerate RAID5/6's XOR with > these code somehow? > RAID5 and RAID6 already use exactly this code to perform xor and RAID6 calculations. If a platform has some sort of co-processor which can do these calculations, md can certainly use that too. Some of the relevant code is in "linux/crypto/async_tx" Other code is elsewhere in the tree. looks for "adma" for "advanced DMA" in file names. NeilBrown
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