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DAOS-15682 dfuse: Perform reads in larger chunks.
When dfuse sees I/O as well-aligned 128k reads then read MB at a time and cache the result allowing for faster read bandwidth for well behaved applicaions and large files. Create a new in-memory descriptor for file contents, pull in a whole descriptor on first read and perform all other reads from the same result. This should give much higher bandwidth for well behaved applications and should be easy to extend to proper readahead in future. Test-tag: test_dfuse_caching_check Signed-off-by: Ashley Pittman <ashley.m.pittman@intel.com>
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