Hacker News: my123

Drawbridge: What SQL Server on Linux is built on (2021)

my123 — Mon, 13 Apr 2026 18:32:10 +0000

Article URL: https://threedots.ovh/blog/2021/01/drawbridge-what-sql-server-on-linux-is-built-on/

Comments URL: https://news.ycombinator.com/item?id=47756116

Points: 2

# Comments: 0

New comment by my123 in "Investigating Split Locks on x86-64"

my123 — Sat, 11 Apr 2026 14:46:22 +0000

Redacted

New comment by my123 in "Investigating Split Locks on x86-64"

my123 — Sat, 11 Apr 2026 06:25:54 +0000

XNU has this oddity: https://github.com/apple-oss-distributions/xnu/blob/f6217f89...

Redacted from open source XNU, but exists in the closed source version

New comment by my123 in "IBM Announces Strategic Collaboration with Arm"

my123 — Thu, 02 Apr 2026 15:29:00 +0000

After Power9, IBM became uncompetitive multi-core performance against mainstream server CPUs - both x86 and Arm. They didn't keep up with the rise in core counts.

And the single thread side isn't that good either, but SMT8 is a quite nice software licensing trick

New comment by my123 in "People inside Microsoft are fighting to drop mandatory Microsoft Account"

my123 — Fri, 27 Mar 2026 17:46:14 +0000

Xcode needs an Apple ID for download but the macOS SDK and toolchain does not.

Try to run any developer tool or "xcode-select install" and it'll download the command-line tools independently from Xcode.

(and then bring your own IDE)

New comment by my123 in "What happened to GEM?"

my123 — Thu, 26 Mar 2026 01:03:50 +0000

There were two entirely separate DOS 4s

The multi-tasking DOS 4 that had its next release be branded as OS/2

and the other one, a conventional DOS stopgap product

New comment by my123 in "Fedora 44 on the Raspberry Pi 5"

my123 — Sun, 15 Mar 2026 16:29:11 +0000

> Which vendors already support this?

One implementation I've seen in the wild is: https://docs.nvidia.com/jetson/archives/r36.4/DeveloperGuide...

Secure Boot is still supported in that configuration, but with PK/db/dbx being part of the firmware configuration and updating them requiring a UEFI capsule update.

New comment by my123 in "Fedora 44 on the Raspberry Pi 5"

my123 — Sun, 15 Mar 2026 11:23:48 +0000

Note that UEFI doesn't mean supporting most of those.

UEFI without runtime UEFI variable writes is a thing, and that configuration is incompatible with mokutil.

New comment by my123 in "Fedora 44 on the Raspberry Pi 5"

my123 — Sat, 14 Mar 2026 23:23:44 +0000

U-Boot nowadays speaks UEFI :) (and so does LK)

New Android devices all use a UEFI bootloader: https://source.android.com/docs/core/architecture/bootloader...

New comment by my123 in "Wired headphone sales are exploding"

my123 — Sat, 14 Mar 2026 20:06:17 +0000

Side note: USB 3 Lightning did exist on iPad Pros.

New comment by my123 in "Prefix sums at gigabytes per second with ARM NEON"

my123 — Fri, 13 Mar 2026 12:40:47 +0000

SME2 is restricted in scope to matrix multiply workloads and isn't really designed for anything else.

The point of streaming SVE is to have a way to pre/post process data on the way in or out of a matrix multiply.

A list that I have around of chips which support various levels of SVE:

For SVE(1) deployment, chips that have it: - Fujitsu A64fx - AWS Graviton3

SVE2: - Snapdragon X2, 8/8 Elite Gen 5 and later - MediaTek Dimensity 9000 and later - NVIDIA Tegra Thor and later, NVIDIA "N1" or later (GB10 is an "N1x" SKU) - Samsung Exynos 2200 or later - AWS Graviton4, Microsoft Cobalt 100, Google Axion (and newer chips) - CIX P1

SME(1) instead of SME2:

- Snapdragon X2, 8/8 Elite Gen 5

SME2:

- Apple M4, A18 and later - Samsung Exynos 2600 - MediaTek Dimensity 9500

Note that the Snapdragon 8/8 Elite Gen 5 and X2 support sve2 but not svebitperm.

New comment by my123 in "Prefix sums at gigabytes per second with ARM NEON"

my123 — Fri, 13 Mar 2026 12:32:44 +0000

Qualcomm was odd like that for a long time yeah.

And yes the Gen 5 chips (8, 8 Elite and X2) do implement SVE2 and SME.

New comment by my123 in "A new Oracle Solaris Common Build Environment (CBE) release"

my123 — Tue, 10 Mar 2026 19:12:46 +0000

AmpereOne M with MTE is out nowadays

New comment by my123 in "MacBook Air with M5"

my123 — Tue, 03 Mar 2026 22:26:33 +0000

LPCAMM2 is more present on business/high end machines unfortunately. It's not an Intel restriction.

New comment by my123 in "Arm's Cortex X925: Reaching Desktop Performance"

my123 — Tue, 03 Mar 2026 22:24:52 +0000

Google outright has worst in class SoCs on both CPU and GPU unfortunately.

If you want something more perf competitive, pick Dimensity, Exynos, or Snapdragon.

New comment by my123 in "Arm's Cortex X925: Reaching Desktop Performance"

my123 — Tue, 03 Mar 2026 12:07:54 +0000

> While the parent article shows AMD Zen 5 having significantly better results in floating-point SPEC CPU2017, these benchmark results are still misleading, because in properly optimized for AVX-512 applications the difference between Zen 5 and Cortex-X925 would be much greater. I have no idea how SPEC has been compiled by the author of the article, but the floating-point results are not consistent with programs optimized for Zen 5.

The arithmetic intensity of most SPECfp subtests is quite low. You see this wall because it ends up reaching bandwidth limitations long before running out of compute on cores with beefy SIMD.

New comment by my123 in "AVX2 is slower than SSE2-4.x under Windows ARM emulation"

my123 — Wed, 18 Feb 2026 15:55:59 +0000

It took until Alder Lake-N for the atom-grade stuff to have AVX2 across the board.

New comment by my123 in "AVX2 is slower than SSE2-4.x under Windows ARM emulation"

my123 — Wed, 18 Feb 2026 15:54:15 +0000

The Oryon 3rd gen in the Snapdragon X2 has SVE2 (as does NVIDIA N1x, currently pre-launched of sorts on the DGX Spark)

Latest VirtualBox Code Begins Supporting KVM Back End

my123 — Fri, 06 Feb 2026 13:47:28 +0000

Article URL: https://www.phoronix.com/news/VirtualBox-Upstream-With-KVM

Comments URL: https://news.ycombinator.com/item?id=46912777

Points: 7

# Comments: 0

New comment by my123 in "Demystifying ARM SME to Optimize General Matrix Multiplications"

my123 — Sat, 31 Jan 2026 21:00:18 +0000

Section VII.3 has:

> Libraries such as BLIS [19] lack SME support and are therefore excluded from comparison.