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eliminate read-on-write problem with write buffer padding #329

@tabokie

Description

@tabokie

read-on-write problem refers to when an unaligned write I/O is issued, an additional read is needed to prefetch the data into page cache. In practice we have only observed this phenomenon when log recycling is enabled.

The situation can be improved by:

  • Support Direct I/O #168
  • When write offset is 4K aligned, zero-pad the write buffer into multiple of 4K. This way we can always initialize the page cache without reading.

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