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From Romain Hardouin <romainh...@yahoo.fr.INVALID>
Subject Re: Meltdown/Spectre Linux patch - Performance impact on Cassandra?
Date Fri, 05 Jan 2018 16:44:15 GMT
  Hi,
We also noticed an increase of CPU - both system and user - on our c3.4xlarge fleet. So far
it's really visible with max(%user) and especially max(%system), it has doubled!I graphed
a ratio "write/s / %system", it's interesting to see how the value dropped yesterday, you
can see it here: https://ibb.co/dnVcHG
For reference: https://aws.amazon.com/fr/security/security-bulletins/AWS-2018-013/
Best,
Romain

    Le vendredi 5 janvier 2018 à 13:09:35 UTC+1, Steinmaurer, Thomas <thomas.steinmaurer@dynatrace.com>
a écrit :  
 
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Hello,
 
  
 
has anybody already some experience/results if a patched Linux kernel regarding Meltdown/Spectre
is affecting performance of Cassandra negatively?
 
  
 
In production, all nodes running in AWS with m4.xlarge, we see up to a 50% relative (e.g.
AVG CPU from 40% => 60%) CPU increase since Jan 4, 2018, most likely correlating with Amazon
finished patching the underlying Hypervisor infrastructure …
 
  
 
Anybody else seeing a similar CPU increase?
 
  
 
Thanks,
 
Thomas
 
  
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