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 <[email protected]>
To: [email protected]
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
<[email protected]> 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: [email protected]
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
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