0cee24064a
FreeBSD #xxx: Dramatically optimize listing snapshots when user
requests only snapshot names and wants to sort them by name, ie.
when executes:
# zfs list -t snapshot -o name -s name
Because only name is needed we don't have to read all snapshot
properties.
Below you can find how long does it take to list 34509 snapshots
from a single disk pool before and after this change with cold and
warm cache:
before:
# time zfs list -t snapshot -o name -s name > /dev/null
cold cache: 525s
warm cache: 218s
after:
# time zfs list -t snapshot -o name -s name > /dev/null
cold cache: 1.7s
warm cache: 1.1s
NOTE: This patch only appears in FreeBSD. If/when Illumos picks up
the change we may want to drop this patch and adopt their version.
However, for now this addresses a real issue.
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #450
|
||
|---|---|---|
| .. | ||
| mount_zfs | ||
| vdev_id | ||
| zdb | ||
| zfs | ||
| zinject | ||
| zpios | ||
| zpool | ||
| zpool_id | ||
| zpool_layout | ||
| ztest | ||
| zvol_id | ||
| Makefile.am | ||
| Makefile.in | ||