Это чисто с помощью силы воли. Мощно 🔥 С наступающим всех вас! Будьте лучшей версией себя

Сегодня ровно 4 года, как я перестал употреблять алкоголь 🎃 а завтра будет ровно 1 год, как бросил курить 🥶

Happy NY everyone! :) I'm officially starting this year with new opportunities and new research and new explorations 🍀🤞🚀

novitoll.com/CV.pdf

Windows Task Manager history from its author, Dave Plummer, retired Microsoft Engineer

https://youtu.be/Ve95Nh690l0?si=EPBw36kezVn0G_JC

HPC - Infiniband vs RoCEv2

Learning about HPC (high-performance computing) infrastructure and standards. Also known as supercomputers require high-speed transport and broad bandwidth. We're talking from 10Gbps up to 400Gbps.

Most of wired OSI L2 we know is Ethernet with MAC overhead etc.
62% supercomputers use Infiniband standard (June 2022).
1% HPC uses Ethernet.

=== 1st pic
Now Infiniband (IB) requires own architectures and NICs (HCA in 1st pic), natively provides RDMA*, and has lower latency than Ethernet due to efficient L2, L3+ layers usage for HPC env rather than generic Ethernet L2 switches.

IB has own denotion (?) like EDR, HDR, NDR etc. like Ethernet 100GbE, 200GbE, 400GbE etc.

IB in Linux Kernel has 4096 max MTU.

=== 2nd pic
Mellanox is the 1st company that implemented standard RoCE (RDMA over Converged Ethernet) and hence most of articles I've read refer to them.

So RoCEv2 (latest) protocol is using Ethernet as L2 (with all Ethernet widespread HW) and UDP/IP (encapsulated in IBTA Protocol for RDMA verbs).

Mellanox Connectx-3 Pro NIC can be used for RoCE protocol (depending on speed and BW needs, e.g. SFP, QSFP+, QSFP28 etc.)

There is Software impl. of RoCE via modprobe rdma_rxe Linux module as well.

There is also "deprecated" iWARP implementation with Ethernet but AFAIU, it sucks, so ignore it — use RoCEv2 if you have Ethernet HW.

=====
In general, comparison between IB and RoCE is written in this article

* RDMA (remote direct memory access) - technology to access remote target's memory without CPU participation in server-server arch.

#hpc #roce #infiniband

https://www.youtube.com/watch?v=wTl4vEednkQ

сниффинг LPC шины для чтения Bitlocker ключа между CPU и TPM, которая незащищена

Также с помощью логического анализатора можно сниффать LPC шину даже если на плате нет CLK, можно самому отсчитывать 40 нс с момента LFRAME down

P.S.: классный YT канал "stacksmashing" на тему hardware security (он также в коллаборации с LiveOverflow с обучающей в ИБ платформой hextree.io)

#hw

solved 60+ leetcode tasks within a month (Jan 7 - Feb 12). Don't waste time while being unemployed :)
Learned about Kadane's algorithm to find max. subarray in O(N) time

https://leetcode.com/problems/maximum-subarray/

#dsa

trending

https://en.wikipedia.org/wiki/Margaret_Hamilton_(software_engineer)

Discussion about disabling GIL in Python 3.13 👀

PYTHON_GIL=0

https://github.com/python/cpython/issues/116167

I wrote my 1st blog post on my website and started with:

Mutt setup with Gmail labels for Linux kernel emails

https://novitoll.com/posts/2024-4-09/mutt.html

This is my 1st experience with mutt, so configs are not advanced per se.

#linux

Found my old commit to cvehound. Nice tool to scan your linux kernel sources dump for known CVEs.

It uses Coccinelle which is SmPL (Semantic Patch Language)
and is used in Linux kernel as official tool as well.

Btw, it's also a project as "coccinelle-for-rust" for Rust integration in Linux kernel,
which needs further support.
pahole for rust also needs more support for rust-in-linux kernel integration 👀

Compared structs via pahole tool of C, Go, Rust languages.

https://novitoll.com/posts/2024-4-21/pahole.html

Submitted my first commit to Go 1.23 lang 🎉
where I've reduced 80 bytes of go runtime memory,
insignificant but interesting start