Re: [Xen-users] Basic Question: Accessing the console on Dom0 (Xen4.5-Ubuntu1504)

[Vladimir Botka <vbotka@xxxxxxxxx>]

Hi Jeff,

On Mon, 17 Aug 2015 03:45:34 +0000
Jeff Murdoch <dochsavage@xxxxxxxxx> wrote:
> Many thanks.   That helped a bit.  I'm able to switch to tty1 and
> tty2, etc which gives some flexibility.
> Going back to the UI via startx is another issue; just getting a blank
> screen with a cursor.   Still, an improvement.
> Meanwhile, in Xen-land, I've been able to set up the usual networking
> in /etc/network/interfaces.
> That is, I can ping external sites.
> The indications I'm seeing here seem to indicate that the dom0 (Ubuntu
> 15.04) O/S is having trouble touching the hardware.
> The most lowlevel messages seem to be coming from "mcelog", like so:
> > mcelog --client
> mcelog: client connect: No such file or directory
> mcelog: client command write: Transport endpoint is not connected.
> mcelog: client read:  Invalid argument

        Xen is working fine for me in Xubuntu 15.04 with kernel 4.1.5
        http://linuxg.net/install-kernel-4-1-x-on-ubuntu/
        I recommend http://xubuntu.org/ .

        # uname -a
        Linux planb 4.1.5-040105-generic #201508101730 SMP Mon Aug 10
        21:44:30 UTC 2015 i686 i686 i686 GNU/Linux
        # xl list
        Name             ID     Mem     VCPUs
        Domain-0         0      4094    4
        freebsd-11.hvm   1      2048    2

> I see a lot of rss-counter state errors and and "Segmentation fault
> (core dumped)" messages, which just can't be good.
> The rss messages look thus:
> [timestamp]  BUG: Bad rss-counter state mm:ffff880415295180 idx:1
> val: 2 (idx and val values vary)
> Segmentation fault (core dumped)
> When I use startx to bring up a new UI and start a terminal, I was
> able to try to start firefox:
> > firefox &
> GLib -CRITICAL **: g_slice_set_config: assertion 'sys_page_slice=0'
> failed.

        Chrome is working fine for me.
        # dpkg -l | grep google-chrome
        ii  google-chrome-stable 44.0.2403.155-1 i386 The web browser
        I recommend chrome.
        http://aosabook.org/en/posa/high-performance-networking-in-chrome.html

        Tuning improves the performance 
        # grep -r GRUB_CMDLINE_XEN_DEFAULT /etc/default/grub
        GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=4096M,max:4096M"
        http://wiki.xenproject.org/wiki/Xen_Project_Best_Practices
        http://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance

> And in desperation, I consulted "top" to see what is running.  I see
> a lot of error handling.
> - apport
> - oopsie
> - upstart
> - update-manager (?)
> I'm obviously not sure about the details, but this collection of
> messages seems to point to a serious disconnect between dom0 (Ubuntu
> 15.04) and my hardware:  Asus Formula V (latest 2012 BIOS).
> Hopefully, the above info will ring some bells.  Is trying a full
> re-install with Ubuntu 14.04 LTS something I should consider here?

        I'm running it on Lenovo E130 with 8GB memory.

        Bridge is working fine with openvswitch and disabled
        NetworkManager
        
https://help.ubuntu.com/community/NetworkManager#Disabling_NetworkManager

        "Using Open vSwitch"
        https://help.ubuntu.com/community/Xen

        # dpkg -l | grep openvswitch
        ii openvswitch-common 2.3.1-0ubuntu1 i386 Open vSwitch common
        ii openvswitch-switch 2.3.1-0ubuntu1 i386 Open vSwitch switch

        # cat /etc/network/interfaces
        # interfaces(5) file used by ifup(8) and ifdown(8)
        auto lo
        iface lo inet loopback
        auto eth0
        iface eth0 inet manual
        allow-hotplug ovsbr0
        iface ovsbr0 inet dhcp
              bridge_ports eth0

        # ovs-vsctl show
        b170c8d6-642a-4deb-adbc-3333331e6df7
            Bridge "ovsbr0"
                Port "ovsbr0"
                    Interface "ovsbr0"
                        type: internal
                Port "eth0"
                    Interface "eth0"
            ovs_version: "2.3.1"

HTH, Cheers

        -vlado

> Best regards,
> Doch
> 
> On Thu, Aug 13, 2015 at 6:35 AM, Matthias Hoffmann
> <debian@xxxxxxxxxxxxxxxx> wrote:
> > Hi,
> > > Here's the newbie bit:  I can't open the console.  I have to kill
> > > GNOME
> > to get a CLI.
> > > If I try the usual Control-Alt-T method or even the
> > > right-click-menu to
> > open a console, the session quickly slows to a crawl then halts.  A
> > hard restart is only way out at this point.
> > Sounds really strange, open a CLI should not be a problem at this
> > point.
> > Afaik you could use Control+Alt+F2 [Or F3, F4, etc.] to switch to
> > tty2 [3, 4 ..] with Gnome installed. BTW maybe this helps:
> > http://askubuntu.com/questions/403819/ctrlaltt-not-working
> > Best regards,
> > Matthias
> >
> > *Von:* xen-users-bounces@xxxxxxxxxxxxx [mailto:
> > xen-users-bounces@xxxxxxxxxxxxx] *Im Auftrag von *Jeff Murdoch
> > *Gesendet:* Donnerstag, 13. August 2015 04:31
> > *An:* xen-users@xxxxxxxxxxxxx
> > *Betreff:* [Xen-users] Basic Question: Accessing the console on Dom0
> > (Xen4.5-Ubuntu1504)
> > Hi,
> > I'm something of a Xen padawan, but I've jumped in both feet, and
> > so, of course, I'm stuck.
> > I've installed Ubuntu 15.04 on LVM,
> > followed by the usual apt-get update-of-everthing,
> > followed by the installation of the Xen 4.5 hypervisor package.
> > So far, so good, as I can boot easily via Grub2 into the Xen
> > hypervisor O/S (dom0).
> > My next step would be to open a console and configure networking
> > (bridge).
> > Here's the newbie bit:  I can't open the console.  I have to kill
> > GNOME to get a CLI.
> > If I try the usual Control-Alt-T method or even the
> > right-click-menu to open a console, the session quickly slows to a
> > crawl then halts.  A hard restart is only way out at this point.
> > I saw a reference regarding tty2 being the dom0 console location.
> > What have I missed here?  Hopefully, something obvious.
> > Best regards,
> > Doch

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