* Live migration-delay in gratuitous arp
@ 2011-01-12 2:51 Virajith Jalaparti
0 siblings, 0 replies; only message in thread
From: Virajith Jalaparti @ 2011-01-12 2:51 UTC (permalink / raw)
To: Xen User-List, xen-devel
Hi,
I was trying to perform live migration with a VM on a LAN and measure
the downtime seen by an application (e.g. ping), the time for which the
application cannot communicate with the VM. The application is run on a
machine different from those between which the VM is migrated. I noticed
that the VM remains unreachable for nearly 1-1.5sec. However the
xend.log file says that the time (the delta) for the last round of the
migration is around 100msec. So, the VM is actually paused for just
around 100msec but the application cannot reach it for 1-1.5sec. I
believe this is because of the delay in the gratuitous ARP being sent.
Is the implementation such that the ARP is not sent immediately after
the migration is finished? Is there an easy tweak (without modifying
source code) by which I can correct this or do I have to modify the
source code?
I am using Xen from the repos of CentOS 5.5 on a 64bit machine.
Thanks,
Virajith
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2011-01-12 2:51 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-12 2:51 Live migration-delay in gratuitous arp Virajith Jalaparti
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).