K 10 svn:author V 3 mav K 8 svn:date V 27 2018-01-22T05:55:43.330860Z K 7 svn:log V 607 8835 Speculative prefetch in ZFS not working for misaligned reads illumos/illumos-gate@5cb8d943bc8513c6230589aad5a409d58b0297cb https://www.illumos.org/issues/8835: Sequential reads not aligned to block size are not detected by ZFS prefetcher as sequential, killing prefetch and severely hurting performance. It is caused by dmu_zfetch() in case of misaligned sequential accesses being called with overlap of one block. Reviewed by: Matthew Ahrens Reviewed by: Allan Jude Approved by: Gordon Ross Author: Alexander Motin END