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the vfs.read_max default. For most systems this means going from 128 KiB to 256 KiB, which is still very conservative and lower than what most other operating systems use, but as a sane default should not interfere much with existing systems. For systems with RAID volumes and/or virtualization envirnments, where read performance is very important, increasing this sysctl tunable to 32 or even more will demonstratively yield additional performance benefits. If MAXPHYS ever gets bumped up, it will probably be a good idea to slave read_max to it.
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