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From: Ivan Voras <ivoras@freebsd.org>
Date: Thu, 21 Jul 2011 22:34:11 +0200
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To: Luiz Otavio O Souza <lists.br@gmail.com>
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Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS and large directories - caveat report
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On 21 July 2011 22:31, Luiz Otavio O Souza <lists.br@gmail.com> wrote:
> On Jul 21, 2011, at 5:04 PM, Ivan Voras wrote:
>
>> The "load.." lines in between are =C2=A0me hitting Ctrl-T for process in=
fo.
>> Observe almost 20 seconds delay in the middle of "ls"!
>
> What do you have for the the first column on gstat (L(q) values) ?
>
> The server in question is a DELL R710 that comes as a poor choice on boug=
ht (nobody notice the SATA disks until the server was installed - then it w=
as too late for a exchange).
>
> It was a lot worse at beginning and adding the following lines (to /boot/=
loader.conf) did help a little bit (it is usable now, even when it is fully=
 loaded by find requests - usable but not normal -).
>
> vfs.zfs.vdev.min_pending=3D1
> vfs.zfs.vdev.max_pending=3D1
>
> Not sure if this will help with your hardware, but you can give it a try =
if you're seeing high values for the L(q) column.

Thanks for the tip but no, device queues are very short (1-2).