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25ea8ce94b
Track history in context of bursts, not individual log blocks. It allows to not blow away all the history by single large burst of many block, and same time allows optimizations covering multiple blocks in a burst and even predicted following burst. For each burst account its optimal block size and minimal first block size. Use that statistics from the last 8 bursts to predict first block size of the next burst. Remove predefined set of block sizes. Allocate any size we see fit, multiple of 4KB, as required by ZIL now. With compression enabled by default, ZFS already writes pretty random block sizes, so this should not surprise space allocator any more. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15635 |
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