Hello Ben,

thanks for the notice. Similar here + others reporting as well: https://blog.appoptics.com/visualizing-meltdown-aws/
Regards,
Thomas

From: Ben Slater [mailto:[EMAIL PROTECTED]]
Sent: Freitag, 12. Jänner 2018 23:37
To: [EMAIL PROTECTED]
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 that has significantly reduce the performance impacts - back pretty close to pre-patch levels. Yet to see if the impacts come back with o/s patching on top of the improved hypervisor.

Cheers
Ben

On Thu, 11 Jan 2018 at 05:32 Jon Haddad <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
For what it’s worth, we (TLP) just posted some results comparing pre and post meltdown statistics: http://thelastpickle.com/blog/2018/01/10/meltdown-impact-on-latency.html

On Jan 10, 2018, at 1:57 AM, Steinmaurer, Thomas <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:

m4.xlarge do have PCID to my knowledge, but possibly we need a rather new kernel 4.14. But I fail to see how this could help anyway, cause this looks highly Amazon Hypervisor patch related and we do not have the production instances patched at OS/VM level (yet).

Thomas

From: Dor Laor [mailto:[EMAIL PROTECTED]]
Sent: Dienstag, 09. Jänner 2018 19:30
To: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
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 AM, Steinmaurer, Thomas <[EMAIL PROTECTED]<mailto:[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 less negligible, so looks highly Hypervisor related.

Regards,
Thomas

From: Steinmaurer, Thomas [mailto:[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>]
Sent: Freitag, 05. Jänner 2018 12:09
To: [EMAIL PROTECTED]<mailto:[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

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