5164 space_map_max_blksz causes panic, does not work 5165 zdb fails assertion when run on pool with recently-enabled spacemap_histogram feature Reviewed by: Christopher Siden <christopher.siden@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com> Approved by: Dan McDonald <danmcd@omniti.com>

4976 zfs should only avoid writing to a failing non-redundant top-level vdev 4977 mdb error in ::spa_space from space_cb() if a metaslab's ms_sm is NULL 4978 ztest fails in get_metaslab_refcount() 4979 extend free space histogram to device and pool 4980 metaslabs should have a fragmentation metric 4981 remove fragmented ops vector from block allocator 4982 space_map object should proactively upgrade when feature is enabled 4983 need to collect metaslab information via mdb 4984 device selection should use fragmentation metric Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Adam Leventhal <adam.leventhal@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Approved by: Garrett D'Amore <garrett@damore.org>

4101 metaslab_debug should allow for fine-grained control 4102 space_maps should store more information about themselves 4103 space map object blocksize should be increased 4104 ::spa_space no longer works 4105 removing a mirrored log device results in a leaked object 4106 asynchronously load metaslab Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Sebastien Roy <seb@delphix.com> Approved by: Garrett D'Amore <garrett@damore.org>

3742 zfs comments need cleaner, more consistent style Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Approved by: Christopher Siden <christopher.siden@delphix.com>

3464 zfs synctask code needs restructuring Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Approved by: Garrett D'Amore <garrett@damore.org>

3552 condensing one space map burns 3 seconds of CPU in spa_sync() thread 3564 spa_sync() spends 5-10% of its time in metaslab_sync() (when not condensing) 3566 recursive mutex panic in specfs Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Richard Lowe <richlowe@richlowe.net>

3329 spa_sync() spends 10-20% of its time in spa_free_sync_cb() 3330 space_seg_t should have its own kmem_cache 3331 deferred frees should happen after sync_pass 1 3335 make SYNC_PASS_* constants tunable Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com> Reviewed by: Christopher Siden <chris.siden@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Richard Lowe <richlowe@richlowe.net> Reviewed by: Dan McDonald <danmcd@nexenta.com> Approved by: Eric Schrock <eric.schrock@delphix.com>

6826241 Sync write IOPS drops dramatically during TXG sync 6869229 zfs should switch to shiny new metaslabs more frequently

6596237 Stop looking and start ganging

6328632 zpool offline is a bit too conservative 6739487 ASSERT: txg <= spa_final_txg due to scrub/export race 6767129 ASSERT: cvd->vdev_isspare, in spa_vdev_detach() 6747698 checksum failures after offline -t / export / import / scrub 6745863 ZFS writes to disk after it has been offlined 6722540 50% slowdown on scrub/resilver with certain vdev configurations 6759999 resilver logic rewrites ditto blocks on both source and destination 6758107 I/O should never suspend during spa_load() 6776548 codereview(1) runs off the page when faced with multi-line comments 6761406 AMD errata 91 workaround doesn't work on 64-bit systems

6280668 pluggable block allocation policy 6399301 initial read of space maps is super slow 6407365 large-sector disk support in ZFS 6407366 ADVANCE_NOLOCK gathers MOS 6407367 three-way deadlock between db_mtx, dbuf_hash[], and ms_lock

PSARC 2002/240 ZFS 6338653 Integrate ZFS PSARC 2004/652 - DKIOCFLUSH 5096886 Write caching disks need mechanism to flush cache to physical media