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Date:      Fri, 18 Dec 2009 17:05:14 +0000
From:      krad <kraduk@googlemail.com>
To:        Alexander Zagrebin <alexz@visp.ru>
Cc:        freebsd-current@freebsd.org
Subject:   Re: ZFS and UFS on the same box. Cache memory allocation issue.
Message-ID:  <d36406630912180905g79c5436eneb2b7c0450572106@mail.gmail.com>
In-Reply-To: <CB674CF3F7F349D39EE24D05B4F8D3DF@vosz.local>
References:  <398F182D4FC14D43A1CFD89C4D69817C@vosz.local> <4B2B52FD.7070206@FreeBSD.org> <CB674CF3F7F349D39EE24D05B4F8D3DF@vosz.local>

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2009/12/18 Alexander Zagrebin <alexz@visp.ru>

> > > As result UFS returns memory to "free" pool and ZFS can
> > allocate it for ARC.
> > > It significantly increases ZFS performance.
> > >
> > > Is there an another workaround?
> >
> > do you know about the following ZFS loader tunables:
> >
> > vfs.zfs.arc_min="400M"
> > vfs.zfs.arc_max="500M"
> >
> > These should be added to /boot/loader.conf (and they can of course be
> > adjusted to make your system behave well ...)
>
> Yes, I do.
> vfs.zfs.arc_min would be used at this situation, but it seems that setting
> this sysctl doesn't help.
>
> --
> Alexander Zagrebin
>
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Not really a proper fix but what happens if you have something defined as
the l2arc device?



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