On Wed, 22 Aug 2012 11:57:02 +0800 Yuanhan Liu <yuanhan.liu@xxxxxxxxxxxxxxx> wrote: > > -#define NR_STRIPES 256 > +#define NR_STRIPES 1024 Changing one magic number into another magic number might help your case, but it not really a general solution. Possibly making sure that max_nr_stripes is at least some multiple of the chunk size might make sense, but I wouldn't want to see a very large multiple. I thing the problems with RAID5 are deeper than that. Hopefully I'll figure out exactly what the best fix is soon - I'm trying to look into it. I don't think the size of the cache is a big part of the solution. I think correct scheduling of IO is the real answer. Thanks, NeilBrown
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