.
Thomas
From: Ben Slater [mailto:ben.sla...@instaclustr.com]
Sent: Freitag, 12. Jänner 2018 23:37
To: user@cassandra.apache.org
Subject: Re: Meltdown/Spectre Linux patch - Performance impact on Cassandra?
We’re seeing evidence across our fleet that AWS has rolled something out in the
last 24 hours
orting as well:
https://blog.appoptics.com/visualizing-meltdown-aws/
Regards,
Thomas
*From:* Ben Slater [mailto:ben.sla...@instaclustr.com]
*Sent:* Freitag, 12. Jänner 2018 23:37
*To:* user@cassandra.apache.org
*Subject:* Re: Meltdown/Spectre Linux patch - Performance impact on
Cassandra?
We’re seein
ed and we do not have the production
instances patched at OS/VM level (yet).
Thomas
From: Dor Laor [mailto:d...@scylladb.com]
Sent: Dienstag, 09. Jänner 2018 19:30
To: user@cassandra.apache.org<mailto:user@cassandra.apache.org>
Subject: Re: Meltdown/Spectre Linux patch - Performance impact o
> instances patched at OS/VM level (yet).
>
> Thomas
>
> *From:* Dor Laor [mailto:d...@scylladb.com ]
> *Sent:* Dienstag, 09. Jänner 2018 19:30
> *To:* user@cassandra.apache.org
> *Subject:* Re: Meltdown/Spectre Linux patch - Performance impact on
> Cassandra?
>
> Make sure
patched at OS/VM level (yet). <>
>
> Thomas
>
> From: Dor Laor [mailto:d...@scylladb.com]
> Sent: Dienstag, 09. Jänner 2018 19:30
> To: user@cassandra.apache.org
> Subject: Re: Meltdown/Spectre Linux patch - Performance impact on Cassandra?
>
> Make sure you pick ins
[mailto:d...@scylladb.com]
Sent: Dienstag, 09. Jänner 2018 19:30
To: user@cassandra.apache.org
Subject: Re: Meltdown/Spectre Linux patch - Performance impact on Cassandra?
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
Longer than that. Years. Check /proc/cpuinfo
--
Jeff Jirsa
> On Jan 9, 2018, at 11:19 PM, daemeon reiydelle 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" wrote:
> Make sur
Hard to tell from the first 10 google search results which Intel CPUs
has it so I went to ask my /proc/cpuinfo, turns out my >1 year Dell XPS
laptop has it. AWS's i3 has it too.
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
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" 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, Steinmaure
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
To: user@cassandra.apache.org
Sent: Tuesday, January 9, 2018 10:31 AM
Subject: Re: Meltdown/Spectre Linux patch - Performance
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://twit
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
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 wrote:
> Hi,
>
> We also noticed an increase of CPU - both system
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: h
Hi Thomas,
No clue about AWS, and it is of course highly dependent on hardware, but on
CentOS 7 on bare metal, the patched kernel
(kernel-3.10.0-693.11.6.el7.x86_64) seems to have a roughly 50% CPU
increase compared to an unpatched kernel
(kernel-3.10.0-693.11.1.el7.x86_64). On a happier note, the
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