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SubjectRe: [resent PATCH] Re: very slow parallel read performance

> - Readahead cache is naturally a fifo - new chunks of readahead
> are added at the head and unused readahead is (eventually)
> culled from the tail.

do you really want to do this based on pages ? Should you not drop all pages
associated with the inode that wasn't touched for the longest time ?
If you are streaming dropping all should be no great loss.

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