Why index file read buffer max size 99 Mib?

[GermanAizek]

@variar,
I want to put higher what actual limit is. And do I understand correctly that for RAID 10 arrays it is necessary to value multiply by number disks, because with "striped set RAID0 from series mirrored RAID1" reading speed increases.

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[variar]

No particular reason. During file indexing there are several blocks of this size in memory, but should be fine to make it a bit larger. Does this improve performance?

For the raid part, I think it does't matter. Klogg has an IO thread that is reading blocks from disk one by one trying to keep some enqueued for indexing thread. All that striped read from actual disk can make IO thread get next block faster, but block size shouldn't change much.