Banana Pi 24-Core ARM Server Running Ubuntu Breaks Cover (hothardware.com)

MojoKid writes: ARM-based server processors have threatened to take on Intel in the data center for some time but not much has materialized thus far in terms of significant deployments. However, a new breed of low cost ARM server implementations may be in the works with a many-core platform called Banana Pi. The latest Banana Pi device being teased is something very different in the form of a 24-core ARM server that speculation suggests might be sold as a Banana Pi server board or as a finished server product.

A video has surfaced that reportedly shows a 24-core ARM Cortex-A53 processor with 32GB of RAM, though the OS only sees 29.4GB of that RAM. The OS is Ubuntu 18.04.1 LTS with MATE desktop. Unless the processor used in this device is something unannounced, and that seems unlikely, the chip itself would likely be a SocioNext SC2A11. The same processor is used in the Linaro Developer Box. The demo shows the server fully loaded at 100% CPU utilization building a Linux kernel and reportedly the system also supports NVMe storage as well as TensorFlow workloads for machine learning. Not much else is known about the system at this time but it's an interesting development in the Linux server space to be sure.

Comments

Spectre: Depends.

[DrYak]

However, AMD and ARM processors are vulnerable to Spectre.

ARM:
Not all ARM processors do speculative execution. Some cheaper/simpler/lower power/lower cost CPUs do execute things normally (in order, no speculative, etc.)
And that's precisely the case of the Cortex-A53 used TFA's server board. No speculative execution, no way to spectre them.
There's no way to exploit them if the exploited functionality doesn't exist.
(BTW: that used to also be the case on some older Intel Atoms and Xeon Phi)

AMD:
Spectre V1 i.e. "speculative execution working as it is supposed to work" (aka.: the behaviour that was already known to exist and was criticized from day 1 of the invention of speculative execution, but was dismissed back then because "what could you possibly learn by loading things into the cache ?". Cue in cache access timing a few decades later and suddenly it seems a bit more nefarious) is the only one that has been successfully demonstrated on AMD CPU.
And even that one is still an application reading its own memory to which that it already has access to begin with. Nothing freaking and scary, just go learn to keep 3rd party executed code and critically important data separated (e.g.: don't run your password management plug-in in the same web browser process as the JavaScript in tabs that runs any shit you pull from the internet), because you're just one bug away from disaster, be it Spectre or not.

Most of the freaky ones (Meltdown) aren't affecting, because AMD engineers don't have a tendency to throw all security through the window just to scrape a few cycles in some benchmark.
Others (like Spectre v2) haven't been successfully demonstrated in practice: AMD CPU *do* indirect branch prediction, but have much more complex predictors which are difficult to use reliably and any way the CPU speculates a lot less ahead so there isn't that much you can do here, the later being also true for the couple of other variants that also exist on recent AMDs.

TL;DR: there are orders of magnitude of difference between how Intel CPU are affected by Spectre and every body else in the CPU market.

WARNING: Horrible hardware support!

[Anonymous Coward]

I did a lot of work with "Banana Pi" singe-board computers, and everything thhat comes out with that name, has atrocious hardware support, atrocious hardware and atrocious support.

The hardware is usually barely documented, and does *not* qualify as open hardware, the support forums are censored in Chinese face-saving tradition and full of false promises, and in many, the board design can only be described as *failed*. (E.g. the power regulator not supporting the storage power requirements when powered via USB port. Or the storage and gigabit network interfaces maxing out at 400 MB/s even with tuning.)

Unless you want to be in a world of madness and pain, don't buy them.

(And I'm not one of those who think that China is crap in general. I was very happy with my Blackview BV6000, in all aspects.)