8c4f41ff34
Rewrite the ZFS prefetch code to detect only forward, sequential streams. The following kstats have been added: kstat.zfs.misc.arcstats.sync_wait_for_async How many sync reads have waited for async read to complete. (less is better) kstat.zfs.misc.arcstats.demand_hit_predictive_prefetch How many demand read didn't have to wait for I/O because of predictive prefetch. (more is better) zfetch kstats have been similified to hits, misses, and max_streams, with max_streams representing times when we were not able to create new stream because we already have the maximum number of sequences for a file. The sysctl variable/loader tunable vfs.zfs.zfetch.block_cap have been replaced by vfs.zfs.zfetch.max_distance, which controls maximum bytes to prefetch per stream. illumos/illumos-gate@cf6106c8a0 Illumos ZFS issues: 5987 zfs prefetch code needs work https://www.illumos.org/issues/5987 |
||
---|---|---|
.. | ||
aarch64 | ||
arm | ||
common | ||
intel | ||
mips | ||
powerpc | ||
sparc |