Re: [Xen-API] [XCP-1.6-BETA] SXM migration - ping timeouts

[George Shuklin <george.shuklin@xxxxxxxxx>]

can't believe that.

Or you just use different kernels, or it not related to to 'guest tools' 
shell script.

10.10.2012 01:41, Burnie ÐÐÑÐÑ:
> On 10/09/2012 10:39 PM, Vidar Normann wrote:
> > Actually, I believe this is because it uses gratuitous arp
> > to let the switch(es) the Xen hosts are connected to become aware that
> > the VM has moved.
>
> That makes sense. Seems some arp tables (at the switch?) isn't updated
> very quickly unless xs-tools is installed. And without network traffic
> or link down/up, I guess linux doesn't send arp messages by itself.
>
> Trying to ping from the vm itself during the migration seems to be
> a "workaround".
>
>
> > On Oct 9, 2012 10:33 PM, "George Shuklin" <george.shuklin@xxxxxxxxx
> > <mailto:george.shuklin@xxxxxxxxx>> wrote:
> >
> > It's really strange. xs tools for pv-domain is just simple shell
> > script to report vm internals back to XCP.
> >
> > You can fake it presence with this script (run on host where VM
> > resides):
> > http://wiki.xensource.com/__wiki/XAPI_fake_presence_of_PV___drivers
> > <http://wiki.xensource.com/wiki/XAPI_fake_presence_of_PV_drivers>
> >
> > But behavior is really funny. May be PV presence cause live
> > migration and 'no guest tools' cause nomal migration (with pause and
> > without iterative incremental memory transfer)?
> >
> > On 09.10.2012 23:23, Burnie wrote:
> >
> > When migrating a VM from one standalone server to another, I noticed
> > that there's a huge gain in making sure the VM has xs-tools
> > installed:
> >
> > VM: Centos 6.3 x86_64 - PV
> >
> > - with xs-tools installed:
> > 206 packets transmitted, 205 received, 0% packet loss, time 205680ms
> > rtt min/avg/max/mdev = 0.204/48.439/197.497/78.066 ms
> >
> > - without xs-tools installed:
> > 209 packets transmitted, 157 received, 24% packet loss, time
> > 208432ms
> > rtt min/avg/max/mdev = 0.217/66.975/196.220/84.136 ms
> >
> > In both cases the VM seems to appear in XC within 1-2 seconds on the
> > new server, but without xs-tools, it doesn't seem to do any
> > networking.
> >
> > I dont know if this is normal or not, but I guess it has
> > something to
> > do with some optimized drivers/modules?
> >
> >
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