Improved Performance & Resource Usage For XFS Checksumming With Linux 7.4

Linux 7.4 changes how XFS handles checksummed direct reads, using lazy bounce buffering. Previously XFS bounce-buffered every direct read on devices requiring stable pages for checksumming, burning DRAM bandwidth and CPU, and producing smaller, unaligned I/Os of 1MB minus 4k with 4k pages. Now reads go straight to the user buffer first, and a bounce buffer is only allocated if a checksum failure occurs. Integrity verification also moves out of iomap into the filesystem itself.

Source: https://www.phoronix.com/news/Linux-7.4-XFS-Checksumming. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.

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