[GTALUG] Meltdown performance hit.

Jamon Camisso jamon.camisso at utoronto.ca
Thu Jan 11 23:19:04 EST 2018

On 11/01/18 19:13, Alvin Starr via talk wrote:
> Its a paravirt VM.
> The steal time is much less than 1% bouncing between 0 and 0.2
> Yes it is possible that other VM's are stealing resources leaving less
> compute power for my instance but I have had extremely stable cpu
> utilization going back something like 2 months.
> But the step is significant within a matter of a day it went from 2.5%
> utilization to 17.4% utilization in 2 steps.
> My image is held up by the moderator so I posted here (
> https://owncloud.netvel.net/s/G3HGQUEb5saLBSn )if your interested.
> The timing is suspect and I had another server that sees periodic work
> and it completely collapsed because of the change in performance at just
> the same time.
> A bit of searching shows that others are complaining about the same
> problem.

That does look like a substantial hit. What happens if you try the
workload on a new VM? Roll the dice until you get lucky maybe?

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