From owner-freebsd-fs@FreeBSD.ORG  Thu Jul 21 20:31:48 2011
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From: Luiz Otavio O Souza <lists.br@gmail.com>
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Date: Thu, 21 Jul 2011 17:31:42 -0300
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To: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS and large directories - caveat report
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On Jul 21, 2011, at 5:04 PM, Ivan Voras wrote:

> The "load.." lines in between are  me hitting Ctrl-T for process info.
> 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 =
bought (nobody notice the SATA disks until the server was installed - =
then it was 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.

Luiz=