[Xen-devel] [BUG] Xen live migration dom0 memory

[Epiontis IT <it_mailinglists@xxxxxxxxxxxx>]

Hello,

I already posted on the xen-users list and Ian told me to post a bug
report here. We have the following problem:

When I start a migration with "xl migrate <vm> <destination>" the
destination machine sets up a vm "<vm>--incoming" and seems to sync
memory because "xl list" shows "Mem" for the incoming vm going up
stepwise until 2048. After that though the vm doesn't get launched. The
vm is frozen for about a minute, the dom0 begins swapping out the 2GB to
disk (because it only has 512M available for itself) and a process

/usr/lib/xen-4.5/bin/libxl-save-helper --restore-domain

takes about 90% of the dom0 memory. After that the vm ist launched,
memory consumption goes back to normal, swap space is freed.

I attached several log and output files in xen_bug_report.txt. In
particular Ian wanted to see the pmap of the save helper process which
you can find at the end of the file taken during several phases of the
migration process.


Thank you,
Alex

--
Alexander HÃmmerle

Epiontis GmbH
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Attachment: xen_bug_report.txt
Description: Text document

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