Thanks for the insight, Romain, and providing those numbers. Looking forward to others posting their stats here.
We are running up some tests and will share when available. Cheers! On Sat, Jan 6, 2018 at 3:44 AM, Romain Hardouin <romainh...@yahoo.fr.invalid > wrote: > 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.steinmau...@dynatrace.com> a écrit : > > > 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 > > > The contents of this e-mail are intended for the named addressee only. It > contains information that may be confidential. Unless you are the named > addressee or an authorized designee, you may not copy or use it, or > disclose it to anyone else. If you received it in error please notify us > immediately and then destroy it. Dynatrace Austria GmbH (registration > number FN 91482h) is a company registered in Linz whose registered office > is at 4040 Linz, Austria, Freistädterstraße 313 > <https://maps.google.com/?q=4040+Linz,+Austria,+Freist%C3%A4dterstra%C3%9Fe+313&entry=gmail&source=g> >