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What is DIO?

• Annatar 8y ago
  Direct input/output; the software performs write(2) system calls directly and does its own input/output buffering and scheduling, bypassing the operating system and filesystem driver buffering. For this to be effective and function correctly, the filesystem driver must support mounting in direct input/output mode, or raw character devices must be presented to the software in question. Note that presenting raw block devices bypasses filesystem driver’s buffering, but does not bypass operating system (kernel) buffering, hence character devices must be used to bypass both. Software which uses raw devices usually has sophisticated input/output scheduling and buffering optimally tuned for its use case.