Longer than that. Years. Check /proc/cpuinfo
-- Jeff Jirsa > On Jan 9, 2018, at 11:19 PM, daemeon reiydelle <daeme...@gmail.com> wrote: > > Good luck with that. Pcid out since mid 2017 as I recall? > > > Daemeon (Dæmœn) Reiydelle > USA 1.415.501.0198 > > On Jan 9, 2018 10:31 AM, "Dor Laor" <d...@scylladb.com> wrote: > Make sure you pick instances with PCID cpu capability, their TLB overhead > flush > overhead is much smaller > >> On Tue, Jan 9, 2018 at 2:04 AM, Steinmaurer, Thomas >> <thomas.steinmau...@dynatrace.com> wrote: >> Quick follow up. >> >> >> >> Others in AWS reporting/seeing something similar, e.g.: >> https://twitter.com/BenBromhead/status/950245250504601600 >> >> >> >> So, while we have seen an relative CPU increase of ~ 50% since Jan 4, 2018, >> we now also have applied a kernel update at OS/VM level on a single node >> (loadtest and not production though), thus more or less double patched now. >> Additional CPU impact by OS/VM level kernel patching is more or less >> negligible, so looks highly Hypervisor related. >> >> >> >> Regards, >> >> Thomas >> >> >> >> From: Steinmaurer, Thomas [mailto:thomas.steinmau...@dynatrace.com] >> Sent: Freitag, 05. Jänner 2018 12:09 >> To: user@cassandra.apache.org >> Subject: Meltdown/Spectre Linux patch - Performance impact on Cassandra? >> >> >> >> 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 >> >> 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 > >
