Hi All,Has anyone seen any test results for SQL Server? Although I am a
Cassandra user I do use SQL Server for other companies.
Thanks,-Tony
From: Dor Laor <d...@scylladb.com>
To: user@cassandra.apache.org
Sent: Tuesday, January 9, 2018 10:31 AM
Subject: Re: Meltdown/Spectre Linux patch - Performance impact on Cassandra?
Make sure you pick instances with PCID cpu capability, their TLB overhead
flushoverhead 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 lessnegligible, so looks highly
Hypervisor related. Regards,Thomas From: Steinmaurer, Thomas
[mailto:thomas.steinmaurer@ 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
313The 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
