THE DIFF
Data Centers Ditching AC for DC Power
To combat rising energy costs, data centers are shifting from AC to 380-volt DC power distribution. This move eliminates multiple AC-to-DC and DC-to-AC power conversions between the grid and the server rack, which can waste up to 20% of total energy. Direct DC power reduces conversion losses, requires less complex hardware like UPS and PDUs, and can result in a 5-10% overall improvement in Power Usage Effectiveness (PUE). It’s a fundamental change at the physical layer that impacts both cost and reliability.
Source: Hacker News
New RFC Aims to Kill Bearer Token Replay Attacks
The IETF has published RFC 9771, standardizing a ‘Demonstrating Proof-of-Possession’ (DPoP) mechanism for JWTs. Unlike standard bearer tokens which can be stolen and replayed, DPoP binds a token to a specific client’s public/private key pair. The client signs parts of the HTTP request, and the server verifies this signature against a public key hash embedded in the JWT. This makes stolen tokens useless without the corresponding private key, forcing an update to your auth libraries in the near future.
Source: IETF
RARE EARTH
Weft: A P2P Log Aggregator Built on Kademlia DHT
A new open-source project called Weft implements a log shipper and aggregator using a Kademlia-based Distributed Hash Table (DHT). Instead of forwarding logs to a central service like an ELK stack, each Weft agent participates in a peer-to-peer network. Logs are content-addressed and stored across the DHT, with queries gossiped through the network. The design claims high resilience to network partitions and avoids the single point of failure and cost of a central logging cluster. It’s an interesting, if niche, approach to a solved problem.
Source: GitHub
TOOL OF THE WEEK
AI Roundtable: Pit 200 LLMs Against Each Other
AI Roundtable is a web tool for running the same prompt against up to 200 different LLMs simultaneously. It provides structured, side-by-side results, allowing you to quickly evaluate which model family best handles your domain-specific queries without API wrangling. Its ‘debate’ feature, where models see each other’s reasoning and can revise their answers, is particularly useful for exposing model biases and weaknesses before you commit to a provider. This is an indispensable free tool for any team doing serious model selection.
Source: Hacker News
MAG 7 NEWS
AWS Bypasses EBS with New Direct-Attach NVMe Instances
New m8gn and r8gn instance types have appeared in select AWS regions, powered by unannounced Graviton5 processors. Documentation reveals these instances feature physically-local NVMe storage that is not part of the Elastic Block Store (EBS) network fabric. This direct-attached architecture provides microsecond-level latency, a significant reduction from the millisecond-latency typical of even io2 Block Express volumes. The move targets high-frequency trading and large cache workloads that have historically run on-prem for performance reasons.
Source: AWS Compute Blog