Chips and Cheese
Arm’s Cortex A73: Resource Limits, What are Those?
#ChipAndCheese

Telegraph | source
(author: clamchowder)

Telegraph

Arm’s Cortex A73: Resource Limits, What are Those?

Arm (the company) enjoyed plenty of design wins towards the mid 2010s. Their 32-bit Cortex designs scored wins in Nvidia’s Tegra 3 and Tegra 4. Samsung’s Exynos chips in the Galaxy S4 and S5 also used Cortex cores. But Arm faced constant competition from…

Chips and Cheese
A Video Interview with Mike Clark, Chief Architect of Zen at AMD
#ChipAndCheese

Telegraph | source

Chipsandcheese

A Video Interview with Mike Clark, Chief Architect of Zen at AMD

Today’s “article” is a little bit different to what you readers are used to.

Matt Keeter
Beating the compiler

source
(author: Matt Keeter ([email protected]))

或者写一篇《敏捷香山不敏捷》

Easton Meow | 是满满

明天写篇博客

再写一篇《为什么科研不能使用RTL》

香山gem5无法支撑体系结构科研

明天写篇博客

什么gem5用不了一点

明天开始学习

发文章还得看chanpsim

急急急急

Daniel Lemire's blog
Benchmarking ARM processors: Graviton 4, Graviton 3 and Apple M2

Telegraph | source

Telegraph

Benchmarking ARM processors: Graviton 4, Graviton 3 and Appl…

The world of commodity processor is roughly divided in two: x64 chips for servers and PCs, and ARM processors for mobile devices. However, ARM chips increasingly common on servers and laptop. My own favorite laptop is an Apple macBook with an M2 chip. Amazon…

Chips and Cheese
Qualcomm’s Oryon Core: A Long Time in the Making
#ChipAndCheese

Telegraph | source

Telegraph

Qualcomm’s Oryon Core: A Long Time in the Making

In 2019, a startup called Nuvia came out of stealth mode. Nuvia was notable because its leadership included several notable chip architects, including one who used to work for Apple. Apple chips like the M1 drew recognition for landing in the same performance…

Matt Keeter
Raven

A flexible Uxn + Varvara emulator

source
(author: Matt Keeter ([email protected]))

Daniel Lemire's blog
Scan HTML faster with SIMD instructions: .NET/C# Edition

Telegraph | source

Telegraph

Scan HTML faster with SIMD instructions: .NET/C# Edition

Recently, the two major Web engines (WebKit and Chromium) adopted fast SIMD routines to scan HTML content. The key insight is to use vectorized classification (Langdale and Lemire, 2019): you load blocks of characters and identify the characters you seek…

Chips and Cheese
The Snapdragon X Elite’s Adreno iGPU
#ChipAndCheese

Telegraph | source
(author: clamchowder)

Telegraph

The Snapdragon X Elite’s Adreno iGPU

Qualcomm is no stranger to integrated graphics. Their Adreno GPU line has served through many generations of Snapdragon cell phone SoCs. But Qualcomm was never content to stay within the cell phone market, and harbored ambitions to move into higher power…

Arch Linux: Recent news updates
The sshd service needs to be restarted after upgrading to openssh-9.8p1

After upgrading to openssh-9.8p1, the existing SSH daemon will be unable to accept new connections (see https://gitlab.archlinux.org/archlinux/packaging/packages/openssh/-/issues/5).
When upgrading remote hosts, please make sure to restart the sshd service using systemctl try-restart sshd right after upgrading.

We are evaluating the possibility to automatically apply a restart of the sshd service on upgrade in a future release of the openssh-9.8p1 package.

source
(author: Robin Candau)

Race condition in sshd(8)
A critical vulnerability in sshd(8) was present in Portable OpenSSH versions 8.5p1 and 9.7p1 (inclusive) that may allow arbitrary code execution with root privileges.
https://www.openssh.com/releasenotes.html

Qualys Security Advisory: https://www.mail-archive.com/[email protected]/msg00235.html

Mitigation: set LoginGraceTime=0 in sshd_config

Fixing commit: https://github.com/openssh/openssh-portable/commit/81c1099d22b81ebfd20a334ce986c4f753b0db29

Because this fix is part of a large commit (81c1099), on top of an even larger defense-in-depth commit (03e3de4, "Start the process of splitting sshd into separate binaries"), it might prove difficult to backport. In that case, the signal handler race condition itself can be fixed by removing or commenting out the async-signal-unsafe code from the sshsigdie() function; for example:

 sshsigdie(const char *file, const char *func, int line, int showfunc,
     LogLevel level, const char *suffix, const char *fmt, ...)
 {
+#if 0
         va_list args;
 
         va_start(args, fmt);
         sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_FATAL,
             suffix, fmt, args);
         va_end(args);
+#endif
         _exit(1);
 }

www.openssh.org

OpenSSH: Release Notes

OpenSSH release notes

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