nova performance regression

Bug #1227362 reported by Aaron Rosen
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
Fix Released
High
Pádraig Brady

Bug Description

I was benchmarking the lastest code and noticed that nova on master takes a significantly more amount of time for an instance to go from spawning -> ACTIVE then compared to grizzly almost 20Times more.

I'm filing this bug just to track the issue as I try to figure out what is causing the regression.

testing using: nova boot --image cirros-0.3.1-x86_64-uec --nic net-id=<> --flavor 1 --num-instances 20 vm1
on havana vs grizzly.

Aaron Rosen (arosen)
Changed in nova:
assignee: nobody → Aaron Rosen (arosen)
importance: Undecided → High
importance: High → Undecided
Revision history for this message
Aaron Rosen (arosen) wrote :

I can confirm that this issue was introduced sometime between master and 566a44fbdf2516063f34598ba167a4582b90fdac .

Using: 566a44fbdf2516063f34598ba167a4582b90fdac there is no regression.

Revision history for this message
Armando Migliaccio (armando-migliaccio) wrote :

It looks like the culprit is this one: dc1108ecd7835bc8e93d1556c757ed3d935bc11c

Revision history for this message
Armando Migliaccio (armando-migliaccio) wrote :

Switching resize_fs_using_block_device to False is enough to bring the performance back to normal, but I am not sure what's the right fix to go about.

Revision history for this message
Aaron Rosen (arosen) wrote :

Yup, thanks i've confirmed this as well.

Revision history for this message
Armando Migliaccio (armando-migliaccio) wrote :
Changed in nova:
importance: Undecided → High
Aaron Rosen (arosen)
Changed in nova:
assignee: Aaron Rosen (arosen) → Pádraig Brady (p-draigbrady)
status: New → Triaged
Joe Gordon (jogo)
Changed in nova:
milestone: none → havana-rc1
Revision history for this message
Dan Smith (danms) wrote :

This needs to be updated manually after the linked review is committed.

Changed in nova:
status: Triaged → In Progress
Dan Smith (danms)
Changed in nova:
status: In Progress → Fix Committed
Thierry Carrez (ttx)
Changed in nova:
status: Fix Committed → Fix Released
Thierry Carrez (ttx)
Changed in nova:
milestone: havana-rc1 → 2013.2
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