Re: Max. PV and HVM Guests

From: "Pasi Kärkkäinen" <pasik@iki.fi>
To: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@gmail.com>
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
Subject: Re: Max. PV and HVM Guests
Date: Sun, 8 Nov 2009 15:50:31 +0200	[thread overview]
Message-ID: <20091108135031.GI1434@reaktio.net> (raw)
In-Reply-To: <f712b9cf0911080345g2fce2e9fpc998ddcae0afd55b@mail.gmail.com>

On Sun, Nov 08, 2009 at 07:45:01PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    Hi,
> 
>    I have observed that there is a maximum limit to the number of PV or HVM
>    virtual machines you can start before dom0 hangs or crashes.
> 
>    For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the 7th
>    instance. Max I can start is 6 without crashing.
> 
>    For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start the
>    4th instance. Max I can start is 3 without crashing.
> 
>    I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on
>    Intel DQ45CB motherboard.
> 
>    Are the above limits reasonable considering the hardware specifications of
>    my computer?
> 
>    I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels
>    2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host
>    operating system is Fedora 11 Linux x86-64.
> 

Dom0 or Xen shouldn't crash for starting guests.
Sounds like a bug somewhere.

Any errors/tracebacks? Do you have serial console configured? 

-- Pasi