Zygo Blaxell d4b3836493 extentwalker: don't fetch absurd numbers of extents just to throw them away ...

ExtentWalker doesn't gain significant benefits from caching, and the
extra SEARCH_V2 ioctls were blamed for a 33% kernel CPU overhead by perf.

Reduce the number of extents to 16 in lieu of fixing the caching.

This gives a significant speed boost on CPU-bound workloads compared
to the original 1024--almost 40% faster on a single SSD with a filesystem
consisting of raw VM images mounted with compress=zstd.

This also seems to reduce LOGICAL_INO overhead.  Perhaps SEARCH_V2 and
LOGICAL_INO were trying to lock the same extents, and interfering with
each other?

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

2018-09-26 23:29:56 -04:00

..

backtrace.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

bencode.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

btrfs.h

trivial: mass purge of whitespace errors

2017-01-06 22:14:50 -05:00

cache.h

cache: release lock before clearing

2018-02-07 23:14:38 -05:00

chatter.h

Logging: Add log levels to output

2018-01-18 23:41:29 +01:00

cleanup.h

crucible: add cleanup class

2018-01-15 11:07:48 -05:00

crc64.h

Remove unused crc64 function

2016-12-13 12:52:26 +11:00

error.h

crucible: error: record location of exception in what() message

2018-09-14 23:49:51 -04:00

extentwalker.h

extentwalker: don't fetch absurd numbers of extents just to throw them away

2018-09-26 23:29:56 -04:00

fd.h

crucible: Allow setting a relative path option for name_fd()

2017-11-14 01:16:06 +01:00

fs.h

Update btrfs compression types, add ZSTD, drop LAST

2018-01-04 20:32:04 +03:00

limits.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

lockset.h

lockset: drop unused method wait_unlock

2018-01-17 22:30:06 -05:00

ntoa.h

build: OK, maybe 32-bit machines could work

2016-11-26 02:06:28 -05:00

path.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

process.h

bees: dynamic thread pool size based on system load average

2018-09-14 23:50:03 -04:00

progress.h

crucible: progress: drop the set() method

2018-09-14 23:49:54 -04:00

resource.h

crucible: resource: optimize map cleanup

2018-01-17 22:30:07 -05:00

string.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

task.h

bees: add -G/--thread-min option for minimum thread count

2018-09-14 23:50:07 -04:00

time.h

time: add update_monotonic to RateEstimator

2018-01-29 00:51:13 -05:00

uuid.h

bees: remove local cruft, throw at github

2016-11-17 12:12:13 -05:00

version.h

lib: add a version string

2017-01-18 22:17:02 -05:00