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Date:      Mon, 10 Feb 2020 08:45:49 +0000
From:      Erik Lauritsen <eriklauritsen@yandex.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Bad ZFS performance on the desktop
Message-ID:  <38784851581324349@sas2-2d551da8e887.qloud-c.yandex.net>
In-Reply-To: <20200210074555.7f409476708f05bd10c1efb0@sohara.org>
References:  <17394471581319158@vla1-b55dfea406f0.qloud-c.yandex.net> <20200210074555.7f409476708f05bd10c1efb0@sohara.org>

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> On Mon, 10 Feb 2020 07:19:18 +0000
> Erik Lauritsen <eriklauritsen@yandex.com> wrote:
> 
>> I have monitored ZFS using 'top' and can see that it never eats
>> more than half of my memory, so it's not because I'm out of
>> memory.
> 
> Is there any sign of swap activity ? This sounds a lot like swap
> thrashing.

There is no swap activity. I have 16 GB in the box and the ARC is
set to 10GB, but it never reaches that.

Also top shows that the swap is free all the time:

Swap: 2048M Total, 2048M Free

>> I'm thinking about getting a couple of SSDs, but then again I use
>> backup meticulously and perhaps ZFS on a single drive or just UFS
>> is better for the desktop?
> 
> I'm using ZFS on a single SSD for boot (with everything important
> mounted from a NAS running a bunch of mirrors), it's fast but I did have to
> set vfs.zfs.arc_max in /boot/loader.conf (to 2GB on my 8GB machine) in
> order to stop browsers thrashing swap.
> --
> Steve O'Hara-Smith <steve@sohara.org>
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