Random disk I/O slows sync indexing


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I noticed when rebuilding my sync index on upgrading to 1.1.26, that indexing will often force my hard drive into seeking I/O modes (I can hear the disk head thrashing, 13MB/s read speeds, and mostly IOWAIT CPU states), and then randomly switch to sequential reading (silent disk, 80+MB/s read speeds, and less IOWAIT).

You can see the behavior in the attached resource graph (blue is CPU, dark blue is IOWAIT, and orange is HD read):

post-19366-0-75477100-1372904200_thumb.p

It seems like this would be relatively easy thing to fix?

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