Messages in this thread | | | Date | Thu, 23 Feb 2006 21:31:52 +0000 | From | Chris Boot <> | Subject | Re: MD Raid 6: poor algorithm choice? |
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thunder7@xs4all.nl wrote: > From: Chris Boot <bootc@bootc.net> > Date: Thu, Feb 23, 2006 at 06:00:10PM +0000 > >> Hi all, >> >> [4295106.474000] raid6: mmxx2 2500 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? >> >> > Because it is more cache-efficient (allows the other code to run at a > higher speed). This comes up now and again, perhaps these messages > should be rephrased. > I knew there would be a good reason for this, I just couldn't figure it out from those messages. That's a very good explanation indeed, and as you say, perhaps the messages should be updated.
Cheers, Chris
-- Chris Boot bootc@bootc.net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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