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Date:      Thu, 18 Jun 2009 03:07:51 +0300
From:      Dan Naumov <dan.naumov@gmail.com>
To:        Ronald Klop <ronald-freebsd8@klop.yi.org>
Cc:        freebsd-fs@freebsd.org, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>
Subject:   Re: ZFS performance on 7.2-release/amd64 low compared to UFS2 +  SoftUpdates
Message-ID:  <cf9b1ee00906171707r885b33csd4ec9026202bc63@mail.gmail.com>
In-Reply-To: <op.uvo0joki8527sy@82-170-177-25.ip.telfort.nl>
References:  <cf9b1ee00906170034q1cee4581hb518f53e9f368368@mail.gmail.com> <op.uvo0joki8527sy@82-170-177-25.ip.telfort.nl>

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All the ZFS tuning guides for FreeBSD (including one on the FreeBSD
ZFS wiki) have recommended values between 64M and 128M to improve
stability, so that what I went with. How much of my max kmem is it
safe to give to ZFS?


- Dan Naumov





On Thu, Jun 18, 2009 at 2:51 AM, Ronald Klop<ronald-freebsd8@klop.yi.org> wrote:
> Isn't 96M for ARC really small?
> Mine is 860M.
> vfs.zfs.arc_max: 860072960
> kstat.zfs.misc.arcstats.size: 657383376
>
> I think the UFS2 cache is much bigger which makes a difference in your test.
>
> Ronald.
>



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