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SubjectMD Raid 6: poor algorithm choice?
Hi all,

[4295106.360000] raid6: int32x1 714 MB/s
[4295106.381000] raid6: int32x2 742 MB/s
[4295106.403000] raid6: int32x4 632 MB/s
[4295106.429000] raid6: int32x8 523 MB/s
[4295106.453000] raid6: mmxx1 1476 MB/s
[4295106.474000] raid6: mmxx2 2500 MB/s
[4295106.500000] raid6: sse1x1 1375 MB/s
[4295106.521000] raid6: sse1x2 2339 MB/s
[4295106.524000] raid6: using algorithm sse1x2 (2339 MB/s)
[4295106.531000] md: raid6 personality registered for level 6

I just loaded the raid6 module for fun (might end up using it one day), and I
was surprised at its choice of algorithm. By the messages above, I would have
assumed it would choose the mmxx2 algorithm at 2500 MB/s instead of sse1x2 at
the slightly slower 2339 MB/s. This is probably entirely expected behaviour, but
why?

Cheers,
Chris

--
Chris Boot
bootc@bootc.net
http://www.bootc.net/
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