From owner-freebsd-virtualization@FreeBSD.ORG  Thu May  8 20:41:04 2014
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Date: Thu, 08 May 2014 22:40:59 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Andreas Nilsson <andrnils@gmail.com>
Subject: Re: Disk IO throttling for VM guests?
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Andreas Nilsson wrote:
> On Thu, May 8, 2014 at 5:57 PM, Miroslav Lachman <000.fbsd@quip.cz
> <mailto:000.fbsd@quip.cz>> wrote:
>
>     Is there any possibilities to limit disk IO for virtualization guest
>     on FreeBSD?
>     I would like to know, if it is possible to limit IOps for jails, or
>     Bhyve guest, or VirtualBox quests. There are ways to limit CPU or
>     RAM for them, but CPU and RAM are really huge these days. On the
>     other hand, HDDs are still very IO limited and if one guest runs
>     disk IO hungy task, then all other guest are affected / slow.
>
>     I read about plugable GEOM scheduler few years ago (GEOM_SCHED), but
>     it seems that it is dead project and there is no module for it to
>     allow some scheduling according to PID, JID or something like this.
>
>     So do we have anything like this for Jails or Bhyve?
>     http://wiki.qemu.org/Features/ DiskIOLimits
>     http://wiki.smartos.org/ display/DOC/Tuning+the+IO+ Throttle
>
>     Miroslav Lachman
>
>
> Well, there is rctl. I haven't tried it yet though.
>
> Best regards
> Andreas

As far as I know, it is just another way to limit CPU, memory, swap, 
SysV semaphores, but no way to limit disk iops or bandwidth.

Miroslav Lachman