Hardware AMD Zen Naples / EPYC Server Processors (Ryzen 7 desktop equivalent)

eva2000 · May 26, 2018

doesn't seem like good news at all Epyc fail? We can defeat AMD's virtual machine encryption, say boffins

German researchers reckon they have devised a method to thwart the security mechanisms AMD's Epyc server chips use to automatically encrypt virtual machines in memory.

So much so, they said they can exfiltrate plaintext data from an encrypted guest via a hijacked hypervisor and simple HTTP requests to a web server running in a second guest on the same machine.
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To show this, the researchers set up a test system powered by an AMD Epyc 7251 processor with SEV enabled and Debian GNU/Linux installed, running two services – the Apache web server, and OpenSSH – in separate virtual machines. They then modified the system's KVM hypervisor to observe when software within a guest accessed physical RAM.

By firing lots of requests at one of the services, such as fetching a HTML webpage from Apache, the hypervisor can see which pages of physical memory are being used to hold the file. It then switches the page mappings so that an encrypted page in another virtual machine is used by Apache to send the requested webpage, and therefore sends the automatically decrypted memory page of the other VM instead.

That means Apache leaks data from another guest. Over time, the team was able to lift a full 2GB of memory from a targeted VM.
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eva2000 · Jun 11, 2018

@Jimmy AMD EPYC Rome 48C/96T and 64C/128T monsters AMD EPYC Rome Details Trickle Out 64 Cores 128 Threads Per Socket

The next generation of AMD EPYC 7000 series is shaping up to be a Xeon killer. The next-generation AMD EPYC 7000 series is codenamed “Rome” and it is going to be a big deal. Instead of adopting Zen+ like the desktop Ryzen CPUs, the new EPYC generation will use the Zen 2 architecture which means improved IPC gains from two generations of core tweaks. Beyond the IPC gains, the next generation parts will be based on 7nm production.

The impact of leapfrogging Intel and using 7nm is several-fold. First, Rome will have up to 64 cores and 128 threads in a single socket. (Edit June 6, 2018: Mea Culpa. Looks like we got some generational information “confirmed” to us incorrectly. Expect a 48 core / 96 thread generation before a 64 core / 128 thread generation. Still quite a huge gap. DDR4 and interconnect improvement information held up to further confirmations. 64 core / 128 thread apparently is still coming, just missed one generation due to a few words not being typed in messages to us.)
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inthecloudblog · Jun 12, 2018

So there will be a not so far time of dual 64 cores?

Time flies

eva2000 · Jun 12, 2018

Yup Phoronix folks have a good overview of AMD EPYC's evolution over the year so far A Look At How The AMD EPYC Linux Performance Has Evolved Over The Past Year - Phoronix

This comparison boiled down to testing these three EPYC processors with a software stack from 2017 to what's now possible if employing the very latest key software components on the same system. The software stacks included:

2017: Ubuntu 16.04.4 LTS server edition, which by default is on the Linux 4.4 kernel, GCC 5.4 compiler, EXT4 file-system, and the other stock components of Ubuntu Server 16.04 with that being the latest LTS release as of last year.

2018: Ubuntu 18.04 LTS server edition but with having upgraded to the Linux 4.17 kernel and GCC 8.1 for offering the very latest kernel and compiler, given the ongoing Zen tuning that has taken place.
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eva2000 · Aug 22, 2018

Looks like Dropbox is moving to AMD EPYC AMD Business: Dropbox Designs its Custom-Built ... | Community

As vast as the datacenter market is, it’s a relatively short list of companies working together in the day-to-day business. I don’t typically have the pleasure of engaging closely with a company that literally has hundreds of millions of customers like Dropbox. With over 500 million users and 300,000 Dropbox Business customers accessing its global collaboration platform, Dropbox is the latest big name in cloud to deploy the AMD EPYC™ processor in their custom-built infrastructure.

“AMD EPYC is a compelling processor option for our compute technology, providing Dropbox with the technical specifications required to support the workloads that matter to teams and our individual users,” said Rami Aljamal, Head of Hardware Engineering and Supply Chain at Dropbox. “We are excited to deploy EPYC processors and look forward to working closely with AMD in the future.”

Dropbox will leverage AMD EPYC™ 7351P one-socket processor platforms to support future growth beyond its current capabilities and refresh its existing infrastructure for its most demanding compute workloads.

The AMD EPYC™ 7000 series delivers compelling options for the Dropbox offering, meeting performance demands throughout evaluation, qualification and deployment. With 16 high-performance cores on the EPYC 7351P processor and leading-edge memory bandwidth, AMD continues to drive a strong balance of compute and connectivity while eliminating the need for a second socket.
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eva2000 · Aug 24, 2018

Overclockers ! Dual AMD EPYC 7601 overclocked at 4.0Ghz

eva2000 · Aug 26, 2018

AMD EPYC 3251 SoC with 8 core/16 threads is coming soon too AMD EPYC 3251 8 core 16 Thread SoC

TLDR usually loses to EPYC 7251 by a bit. Blows the D-1541 away.
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EPYC Embedded 3251 - AMD - WikiChip

EPYC Embedded 3251 is a 64-bit octa-core x86 embedded microprocessor introduced by AMD in early 2018 for dense servers and edge devices. Fabricated on a 14 nm process based on the Zen microarchitecture, this chip operates at 2.5 GHz with a TDP of 50 W and a turbo frequency of 3.1 GHz. The 3251 supports up to 512 GiB of dual-channel DDR4-2666 ECC memory
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Other AMD Embedded EPYC SoC cpus EPYC Embedded - AMD - WikiChip

eva2000 · Sep 10, 2018

Nice win for AMD EPYC Intel can’t supply 14nm Xeons, HPE directly recommends AMD Epyc

Intel can’t seem to supply 14nm Xeons so HPE is recommending AMD Epycs instead. Most SemiAccurate readers will understand why there is a 14nm shortage at Intel but even with that background, this page is pretty brutal.
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eva2000 · Sep 11, 2018

AMD EPYC 3251 8C/16 cpu 2.5-3.1Ghz benchmarks for US$315 cpu AMD EPYC 3251 Benchmarks and Review the Challenger We Need

There are a total of 8 cores. With 2-way SMT that gives us 16 threads. AMD’s SMT, unlike Intel’s Hyper-Threading, is not susceptible to the L1TF Foreshadow security vulnerability. That means if you are running untrusted code VMs on your embedded platforms, you may have to turn off Hyper-Threading on Intel to make the Xeon D-1500 or Xeon D-2100 more secure. With the AMD EPYC 3000 series, you do not have to do so.

Base clock speeds are 2.5Ghz for the AMD EPYC 3251 part with maximum all core turbo boosts of 3.1GHz. As we will see, the increased clock speeds help the solution perform very well. TDP on the AMD EPYC 3251 is 55W (note current spec is 55W, originally was 50W) putting it between the Xeon D-1500 and D-2100 series. L3 cache comes in at 16MB which is much larger than the Xeon D-1500 and comparable to the combined L2/ L3 cache setup of the Skylake-SP derived Xeon D-2100 cores. The net result is a relatively power efficient part with the capacity to deliver a lot of performance.
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