Date: Thu, 20 Oct 2016 17:17:47 +0100 From: Steven Hartland <killing@multiplay.co.uk> To: freebsd-stable@freebsd.org Subject: Re: zfs, a directory that used to hold lot of files and listing pause Message-ID: <40fa9fd6-15aa-d8f7-b958-8783e763e6bc@multiplay.co.uk> In-Reply-To: <4d9269af-ed64-bb73-eb7f-98a3f5ffd5a2@norma.perm.ru> References: <4d9269af-ed64-bb73-eb7f-98a3f5ffd5a2@norma.perm.ru>
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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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