Do you have atime enabled for the relevant volume?
If so disable it and see if that helps:
zfs set atime=off <volume>
Regards
Steve
On 20/10/2016 14:47, Eugene M. Zheganin wrote:
Hi.
I have FreeBSD 10.2-STABLE r289293 (but I have observed this situation
on different releases) and a zfs. I also have one directory that used
to have a lot of (tens of thousands) files. I surely takes a lot of
time to get a listing of it. But now I have 2 files and a couple of
dozens directories in it (I sorted files into directories).
Surprisingly, there's still a lag between "ls" and an output:
===Cut===
# /usr/bin/time -h ls
.recycle 2016-01 2016-04 2016-07
2016-10 sort-files.sh
2014 2016-02 2016-05 2016-08
ktrace.out sort-months.sh
2015 2016-03 2016-06 2016-09
old sounds
5.75s real 0.00s user 0.02s sys
===Cut===
I've seen this situation before, on other servers, so it's not the
first time I encounter this. However, it's not 100% reproducible (I
mean, if I fill the directory with dozens of thousands of files, I
will not certainly get this lag after the deletion).
Has anyone seen this and does anyone know how to resolve this ? It's
not critical issue, but it makes thing uncomfortable here. One method
I'm aware of: you can move the contents of this directory to some
other place, then delete it and create again. But it's kind of a nasty
workaround.
Thanks.
Eugene.
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