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xen-users
Re: [Xen-devel] Re: [Xen-users] Max. PV and HVM Guests
On Mon, Nov 09, 2009 at 08:01:00PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
> No, I didn't limit dom0 memory in grub.conf.
>
You should.
If dom0 has all the memory at boot time, you need to balloon down dom0
memory every time you create a new guest - this can (and will) cause
problems with the dom0 linux kernel.
Linux calculates some internal parameters/buffers/values based on the
_boot time_ amount of memory. And when the amount of memory goes down to
only a small fraction of that while creating new guests bad things can
happen..
It still shouldn't crash though.. I bet your problem will get fixed when
you limit the dom0 memory to say dom0_mem=512M and reboot.
-- Pasi
> Here's my xm info output after I have shutdown all the virtual machines.
>
> [root@fedora11-x86-64-host ~]# xm list
> Name ID Mem VCPUs State
> Time(s)
> Domain-0 0 2812 2 r-----
> 3242.5
> [root@fedora11-x86-64-host ~]# xm info
> host : fedora11-x86-64-host
> release : 2.6.30-rc3-enming.teo-tip
> version : #1 SMP Wed Aug 19 23:14:15 SGT 2009
> machine : x86_64
> nr_cpus : 2
> nr_nodes : 1
> cores_per_socket : 2
> threads_per_core : 1
> cpu_mhz : 2800
> hw_caps :
> bfebfbff:20100800:00000000:00000140:0400e3bd:00000000:00000001:00000000
> virt_caps : hvm hvm_directio
> total_memory : 6039
> free_memory : 3124
> node_to_cpu : node0:0-1
> node_to_memory : node0:3124
> xen_major : 3
> xen_minor : 5
> xen_extra : -unstable
> xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
> xen_scheduler : credit
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : Tue Sep 01 11:34:31 2009 +0100 20143:a7de5bd776ca
> xen_commandline : iommu=1
> cc_compiler : gcc version 4.4.1 20090725 (Red Hat 4.4.1-2)
> (GCC)
> cc_compile_by : root
> cc_compile_domain : (none)
> cc_compile_date : Thu Sep 10 07:01:13 SGT 2009
> xend_config_format : 4
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: [1]http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: [2]http://enmingteo.wordpress.com
> My Youtube videos: [3]http://www.youtube.com/user/enmingteo
> Email: [4]space.time.universe@xxxxxxxxx
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>
> On Mon, Nov 9, 2009 at 7:54 PM, Pasi Kärkkäinen <[5]pasik@xxxxxx> wrote:
>
> On Mon, Nov 09, 2009 at 06:52:37PM +0800, Mr. Teo En Ming (Zhang Enming)
> wrote:
> > Hi,
> >
> > Please watch this 4-minute video at
> > [1][6]http://www.youtube.com/watch?v=LbLaPpwNAx4
> >
> > I have only started 3 HVM Linux guests with 1 GB ram each. I can't
> start
> > the 4th HVM guest. If I attempt to start the 4th instance, it will
> crash
> > dom0.
> >
> > Are there anything in the xm dmesg output that could explain the
> low limit
> > to the number of VMs that I could start before dom0 becomes
> unresponsive?
> >
>
> Have you limited dom0 memory (by specifying dom0_mem=XMB option in
> grub.conf for xen.gz) ?
>
> What does "xm info" say about free memory before starting any guests?
> -- Pasi
>
> References
>
> Visible links
> 1. http://teo-en-ming-aka-zhang-enming.blogspot.com/
> 2. http://enmingteo.wordpress.com/
> 3. http://www.youtube.com/user/enmingteo
> 4. mailto:space.time.universe@xxxxxxxxx
> 5. mailto:pasik@xxxxxx
> 6. http://www.youtube.com/watch?v=LbLaPpwNAx4
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