Re: [Qemu-devel] [PATCH 3/3] qemu-iotests: Test postcopy migration

[Eric Blake <eblake@redhat.com>]

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On 04/13/2017 12:23 PM, Kevin Wolf wrote:
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  tests/qemu-iotests/181     | 117 +++++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/181.out |  38 +++++++++++++++
>  tests/qemu-iotests/group   |   1 +
>  3 files changed, 156 insertions(+)
>  create mode 100755 tests/qemu-iotests/181
>  create mode 100644 tests/qemu-iotests/181.out
> 

I don't see a 180.out mentioned on-list anywhere (but the choice of test
number is not too serious).

./check -raw 181

 === Write something on the source ===

+WARNING: Image format was not specified for 'TEST_DIR/t.raw' and
probing guessed raw.
+Automatically detecting the format is dangerous for raw images, write
operations on block 0 will be restricted.
+Specify the 'raw' format explicitly to remove the restrictions.


You'll want to fix that.


> +# Slow down migration so much that it definitely won't finish before we can
> +# switch to postcopy
> +silent=yes
> +_send_qemu_cmd $src 'migrate_set_speed 4k' "(qemu)"
> +_send_qemu_cmd $src 'migrate_set_capability postcopy-ram on' "(qemu)"
> +_send_qemu_cmd $src "migrate -d unix:${MIG_SOCKET}" "(qemu)"
> +_send_qemu_cmd $src 'migrate_start_postcopy' "(qemu)"
> +
> +QEMU_COMM_TIMEOUT=1 qemu_cmd_repeat=10 silent=yes \
> +    _send_qemu_cmd $src "info migrate" "completed\|failed"
> +silent=yes _send_qemu_cmd $src "" "(qemu)"

Do we want to tell the source to go back to a higher migrate_set_speed
once we know we are in postcopy mode?  But the test passed for me under
-qcow2 in less than 2 seconds, on an unloaded machine, so hopefully even
on a heavily loaded machine we aren't giving up due to timeouts.


-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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