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| H A D | dmu_zfetch.c | diff 329494 Sun Feb 18 00:30:20 MST 2018 mav MFC r328254: MFV r328253: 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 <mahrens@delphix.com> Reviewed by: Allan Jude <allanjude@freebsd.org> Approved by: Gordon Ross <gwr@nexenta.com> Author: Alexander Motin <mav@FreeBSD.org> |
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