In case of misaligned I/O sequential requests are not detected as such
due to overlaps in logical block sequence:
dmu_zfetch(fffff80198dd0ae0, 27347, 9, 1)
dmu_zfetch(fffff80198dd0ae0, 27355, 9, 1)
dmu_zfetch(fffff80198dd0ae0, 27363, 9, 1)
dmu_zfetch(fffff80198dd0ae0, 27371, 9, 1)
dmu_zfetch(fffff80198dd0ae0, 27379, 9, 1)
dmu_zfetch(fffff80198dd0ae0, 27387, 9, 1)
This patch makes single block overlap to be counted as a stream hit,
improving performance up to several times.
You can view, comment on, or merge this pull request online at:
https://github.com/openzfs/openzfs/pull/497
-- Commit Summary --
* 8835 Speculative prefetch in ZFS not working for misaligned reads
-- File Changes --
M usr/src/uts/common/fs/zfs/dmu_zfetch.c (19)
-- Patch Links --
https://github.com/openzfs/openzfs/pull/497.patch
https://github.com/openzfs/openzfs/pull/497.diff
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