4am AMD Xorg/Kernel Debugging

Ongoing fun ongoes, so much so. This iteration receives triple output: tty video (Display Port), COM1 redirect via DB9 to laptop running minicom, COM2 to the usual BMC SoL terminal watched from ipmitool on adjacent laptop.

Coming up, rebooting into GENERIC-DEBUG kernel rebuilt with remote GDM (kgdb) access via the COM1 link to laptop.

Duelo de titanes: procesadores Intel Xeon y AMD EPYC https://blog.elhacker.net/2025/04/duelo-titanes-procesadores-intel-xeon-vs-amd-epyc.html #procesador #intel #epyc #xeon #amd #cpd #cpu

SMT Remains Very Advantageous For #Zen5 #AMD #EPYC Performance
#SMT typically was of measurable benefit to the 5th Gen AMD EPYC processor with the exception of some #HPC workloads that perform better with SMT disabled or otherwise limited by memory bandwidth. SMT also hurt the OpenVINO inference latency but by and large Simultaneous Multi-Threading remains an important and valuable feature for AMD processors.
https://www.phoronix.com/review/amd-epyc-zen5-smt

The Compelling #AVX512 Performance Advantage On #AMD #EPYC 9005 "Turin"
Workloads tested on this #EPYC9655 Supermicro server, with AVX-512 yielded 1.57x the performance of the same hardware/software but with AVX-512 forced off.
https://www.phoronix.com/review/amd-epyc-turin-avx512

AMD's security cracked to modify the silicon's behaviour at will. This capability also undermines AMD's secure encrypted virtualization & root-of-trust security mechanisms on Ryzen, Threadripper, & Epyc CPUs. https://it.slashdot.org/story/25/02/09/2021244/how-to-make-any-amd-zen-cpu-always-generate-4-as-a-random-number #security #hacking #amd #ryzen #threadripper #epyc

#AMD Moves Up Instinct #MI350/#MI355X To Now Release By Mid-2025, #MI400 Lineup Slated For 2026 As #Datacenter Biz Hits Records
Last year the datacenter business at AMD, which includes #EPYC #CPU, Instinct #GPU, #Pensando #DPU, and #Xilinx #FPGA accelerators, accounted for $12.58 billion in sales, or 48.8% of revenues. In both Q3 and Q4 of 2024, datacenter drove in excess of half of AMD’s revenues and nearly 60% of its operating income.
https://www.nextplatform.com/2025/02/04/amd-moves-up-instinct-355x-launch-as-datacenter-biz-hits-records/

How to Run DeepSeek R1 671B Locally on a $2000 EPYC Server: https://digitalspaceport.com/how-to-run-deepseek-r1-671b-fully-locally-on-2000-epyc-rig/ #linux #llm #deepseek #r1 #epyc #server #selfhosted

#Germany unleashes #AMD-powered Hunter #supercomputer
€15 million system to serve as testbed for larger Herder supercomputer coming in 2027
Built by #HewlettPackardEnterprise (#HPE), Hunter is based on a #Cray EX4000 platform and powered by a combination of AMD Instinct #MI300A accelerated processing units (#APU) and #Epyc Genoa #CPU.
https://www.theregister.com/2025/01/17/hlrs_supercomputer_hunter/

New #BadRAM attack neuters #security assurances in #AMD #Epyc processors

One of the oldest maxims in hacking is that once an attacker has physical access to a device, it’s game over for its security. The basis is sound.
#AMDEpyc

https://arstechnica.com/information-technology/2024/12/new-badram-attack-neuters-security-assurances-in-amd-epyc-processors/

#AMD #EPYC9655 #Benchmarks Show The Terrific Generational Gains With 5th Gen #EPYC Review
Consistent ~1.4x uplift from #EPYC9654 to EPYC 9655 was all more impressive when finding that average #CPU power use only increased by about ~5% on average and only an 11% increase to the default/peak TDP. 5th Gen AMD EPYC processors continue to impress not only for raw performance over prior generation EPYC processors but also for impactful power efficiency improvements out of #Zen5
https://www.phoronix.com/review/amd-epyc-9655

#AMD crafts custom #EPYC #CPU with #HBM3 memory for #Microsoft #Azure – CPU with 88 #Zen4 cores and 450GB of HBM3 may be repurposed #MI300C, four chips hit 7TB/s
#HBv series of Azure #VM are focused on delivering high amounts of memory bandwidth; Microsoft calls it “biggest #HPC bottleneck.” Previously, Microsoft had used #MilanX and #GenoaX with AMD 3D #VCache to provide extra bandwidth, but for latest #HBv5 VMs, Microsoft clearly wanted something even more performant.
https://www.tomshardware.com/pc-components/cpus/amd-crafts-custom-epyc-cpu-for-microsoft-azure-with-hbm3-memory-cpu-with-88-zen-4-cores-and-450gb-of-hbm3-may-be-repurposed-mi300c-four-chips-hit-7-tb-s

SiH²O, TECs, AMD, PPC

Have you ever used a 'thermo-electric cooler' (aka Peltier device)? Have you used one on an AMD Socket AM5, and not burned down the system or frozen cooling lines? If so, I'd love to hear experiences!

I'm considering the above on a hypothesis/PoC sorta basic, insofar as exploring the options for a potential application during restoration of my watercooled PowerMac G5 (4C PPC-970MP).

The last time I looked into TECs was at the start of the water-cooling wars in 1999... assumptions assume that the landscape is more efficient and less slap-together.

#NVIDIA #GH200 Grace #CPU vs. #AMD #EPYC 9005 #Turin CPU Performance Review
The article is focusing just on the CPU performance across these servers. Of course, the main selling point of the GH200 Superchip is when leveraging the Hopper GPU in tandem. But for those curious how well Grace / Neoverse-V2 compares to the new #EPYC9005 series in single socket configurations, hopefully today's numbers provided some insight.
https://www.phoronix.com/review/nvidia-grace-epyc-turin

For the first time ever, #AMD outsells #Intel in the #datacenter
But both fall far behind sales of #Nvidia's #AI #GPU
While Intel's #Xeon #CPU still power the majority of servers, the most expensive machines now use AMD's #EPYC processors. This is why AMD's datacenter business unit now outsells Intel's datacenter and AI business group, as observed by SemiAnalysis.
https://www.tomshardware.com/pc-components/cpus/for-the-first-time-ever-amd-outsells-intel-in-the-datacenter-space

#AMD #EPYC 9755 Performance On The #Linux 6.11 & 6.12 Kernel
In many of the larger, real-world workloads there were minimal to small changes while in more of the micro-benchmarks and other focused areas there were some nice gains observed with Linux 6.11/6.12. With Linux 6.12 expected to be this year's LTS kernel version, it will find use by hyperscalers and other large organizations that tend to jump between the #LTS kernel versions.
https://www.phoronix.com/news/AMD-EPYC-9755-Linux-6.11-6.12

Exploring The #Zen5 #SMT Performance With The #AMD #EPYC 9755 "#Turin" #CPU
While SMT isn't beneficial everywhere, there still are many workloads where Simultaneous Multi-Threading is a valuable asset even with today's very high core count processors. Even with a 128-Core Zen 5 "classic" processor, there are a lot of workloads showing sizable gains for SMT with the EPYC 9755 and 12 channel DDR5-6000 memory.
https://www.phoronix.com/review/amd-epyc-9755-smt

The time when #INTEL dominated CPU performance are LONG gone.

First, raw data.

AMD EPYC 9755
128C/256T
12984 USD
https://amd.com/en/products/processors/server/epyc/9005-series/amd-epyc-9755.html

INTEL XEON 6980p
128C/256T
17800 USD
https://ark.intel.com/content/www/us/en/ark/products/240777/-processor-504m-cache-2-00-ghz.html

Now ...

Recent comparison between 128C/256T offerings from both #AMD and #INTEL shows that #AMD CPU is 40% faster then #INTEL CPU.

Average power usage of both CPUs were VERY similar with 322W for #INTEL and 324W for #AMD.

Peak pwoer value is different and #AMD tops at 500W while #INTEL tops at 547W power.

But that is not end of #INTEL misery ... while #INTEL #XEON 6980p CPU costs $17800 - #AMD #EPYC 9755 CPU costs $12984.

That means that its price/performance ratio is multiplied by another 0.7 factor.

So TOTAL/REAL #AMD CPU price/performance ratio compared to the same #INTEL CPU is 70% better for #AMD.

#AMD Turns The Screws With “#Turin” #Epyc #Server #CPU
Compared to 2009 chips Intel has increased its performance by 62X between the touchstone Xeon E5540 and the top bin Xeon 6 6980P, with power going up by 6.25X to 500 watts, price going up by 23.9X to $17,800, and price/performance improving by 2.6X. On just regular Turin parts, AMD has driven performance up by a factor of 92.93X, power up by 6.7X, price up by 14.9X, and price/performance has improved by 6.25X.
https://www.nextplatform.com/2024/10/10/amd-turns-the-screws-with-turin-server-cpus/

#AMD 128-core #Zen5-based #EPYC9755 'Turin' tested: 2X faster than 128-core predecessor compared to the #Zen4c #EPYC 9654 'Bergamo' in #7Zip
Considering microarchitectural improvements of Zen 5 over Zen 4, higher clocks, and a larger cache, the EPYC 9755 can indeed be two times faster than the EPYC 9654 in many workloads, especially because being Zen 5-based, it is aimed at workloads sensitive to single-thread performance, unlike the Zen 4c-based CPU.
https://www.tomshardware.com/pc-components/cpus/amd-128-core-zen-5-based-epyc-9755-turin-tested-2x-faster-than-128-core-predecessor