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Date:      Fri, 21 Oct 2016 16:51:36 +0500
From:      "Eugene M. Zheganin" <emz@norma.perm.ru>
To:        freebsd-stable@freebsd.org
Subject:   Re: zfs, a directory that used to hold lot of files and listing pause
Message-ID:  <499a3693-d8ea-8b47-138c-77876077967c@norma.perm.ru>
In-Reply-To: <20161021102051.GH57876@zxy.spb.ru>
References:  <4d9269af-ed64-bb73-eb7f-98a3f5ffd5a2@norma.perm.ru> <40fa9fd6-15aa-d8f7-b958-8783e763e6bc@multiplay.co.uk> <577ab7b2-46c1-5cf0-b6ad-50895978d957@norma.perm.ru> <38a84fce-fd97-a6a1-5820-89e578d76f0b@multiplay.co.uk> <91f34889-7f4f-661d-c88f-8034402c39cd@norma.perm.ru> <19a45e94-65e6-53a9-202d-c048055460d1@multiplay.co.uk> <20161021102051.GH57876@zxy.spb.ru>

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Hi.

On 21.10.2016 15:20, Slawa Olhovchenkov wrote:
>
> ZFS prefetch affect performance dpeneds of workload (independed of RAM
> size): for some workloads wins, for some workloads lose (for my
> workload prefetch is lose and manualy disabled with 128GB RAM).
>
> Anyway, this system have only 24MB in ARC by 2.3GB free, this is may
> be too low for this workload.
You mean - "for getting a list of a directory with 20 subdirectories" ? 
Why then does only this directory have this issue with pause, not 
/usr/ports/..., which has more directories in it ?

(and yes, /usr/ports/www isn't empty and holds 2410 entities)

/usr/bin/time -h ls -1 /usr/ports/www
[...]
0.14s real              0.00s user              0.00s sys

Thanks.
Eugene.



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