[GTALUG] Meltdown performance hit.

Alvin Starr alvin at netvel.net
Thu Jan 11 23:35:23 EST 2018


On 01/11/2018 11:19 PM, Jamon Camisso via talk wrote:
> 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?
>

This server is not so bad but it really shows the change in performance.
The one that keeled over on me was on a small instance and I had to move 
it to a large instance.
I did a bunch of database clean and hopefully that will be enough to be 
able to put it back on a small instance.
Otherwise my costs at AWS till jump significantly.

-- 
Alvin Starr                   ||   land:  (905)513-7688
Netvel Inc.                   ||   Cell:  (416)806-0133
alvin at netvel.net              ||



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