Graph for cpu resource usage going backwards

[Matthias Runge]

Yesterday I could produce the attached image when I requested the resource usage.

In the image you can see the line going left and even a loop.

In my opinion this is a bug. By looking at the data my feeling is that there is an smoothing algorithm working at some point in order (my guess) to look like a continuous measurement and it is overdoing.

[Matthias Runge (mrunge)]

Seems like some polynomial interpolation error. Might be related to the big values it has. So this could be solved by unit conversions and showing of more human readable values.

[Ladislav Smola (lsmola)]

As a quick fix I will switch to linear interpolation.

When we finish the unit conversions, we can try this again.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/84463

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/84463
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=8bcc5e9703fa4db5e702685a584d2e91fbea7b4a
Submitter: Jenkins
Branch: master

commit 8bcc5e9703fa4db5e702685a584d2e91fbea7b4a
Author: Ladislav Smola <email address hidden>
Date: Tue Apr 1 16:43:47 2014 +0200

    Cardinal interpolation error

    -Seems like for the big numbers, d3 is interpolating
     data badly and it is creating loops in the chart.
     So quick fix is to switch to linear interpolation
     as default.
    -Other interpolation can be set with settings.

    Change-Id: I82c1514dce6034b3cbc7f95682356a08301482b7
    Fixes-bug: #1295537

[Akihiro Motoki (amotoki)]

Is it icehouse-rc-potential?

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: milestone-proposed
Review: https://review.openstack.org/85631

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/85631
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=6826c57602a10b8c07de8b45d6940db55bd8cbda
Submitter: Jenkins
Branch: milestone-proposed

commit 6826c57602a10b8c07de8b45d6940db55bd8cbda
Author: Ladislav Smola <email address hidden>
Date: Tue Apr 1 16:43:47 2014 +0200

    Cardinal interpolation error

    -Seems like for the big numbers, d3 is interpolating
     data badly and it is creating loops in the chart.
     So quick fix is to switch to linear interpolation
     as default.
    -Other interpolation can be set with settings.

    Change-Id: I82c1514dce6034b3cbc7f95682356a08301482b7
    Fixes-bug: #1295537
    (cherry picked from commit 8bcc5e9703fa4db5e702685a584d2e91fbea7b4a)