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parkbot.bsky.social
Phil Park
@parkbot.bsky.social
530 followers 130 following 340 posts
Burrito scientist, AMD Infinity Fabric performance/architecture. @philparkbot in the Bad Place. Personal account. He/Him.

📍British Columbia

https://linktr.ee/philpark
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parkbot.bsky.social
Phil Park @parkbot.bsky.social · Nov 14
I created a semiconductor professionals starter pack. If there’s anyone I should add, please let me know

go.bsky.app/ShZByxU
parkbot.bsky.social
Supernintendo Chalmers: GOOD LORDI WHAT IS HAPPENING IN THERE? Skinner: NEW PRODIGY SPECS RELEASED Chalmers: SPECS THAT CLAIM IT CAN BEAT AN UNRELEASED PART BY OVER AN ORDER OF MAGNITUDE, WITH MEMORY SPEEDS THAT DON'T EXIST, IN CAPACITIES THAT DON'T EXIST, BY A COMPANY THAT HAS YET TO TAPE OUT A PART? Skinner: YES Chalmers: MAY I SEE IT? Skinner: NO
November 13, 2025 at 2:54 AM
Reposted by Phil Park
jangray.bsky.social
What a processor’s front end sees
jenmsft.bsky.social Jen Gentleman @jenmsft.bsky.social · 18d
Walking around in Seattle right now
Buzz and Woody together from toy story - Buzz gestures out yonder while Woody looks concerned. "Branches. Branches everywhere" buzz says
October 26, 2025 at 3:45 PM
parkbot.bsky.social
I watch horror movies primarily because it’s my marriage tax but I genuinely enjoyed Weapons.

www.imdb.com/title/tt2658...
Weapons (2025) ⭐ 7.5 | Horror, Mystery
2h 8m | R
www.imdb.com
October 22, 2025 at 7:15 PM
parkbot.bsky.social
Conversion therapy is another term for child abuse.
yasharali.bsky.social Yashar Ali 🐘 @yasharali.bsky.social · Oct 7
A majority of the Supreme Court signaled Tuesday it is prepared to rule against Colorado’s ban on “conversion therapy” for minors, with several justices signaling they agree with a licensed counselor in the state who says the law violates her First Amendment rights.

Full Story: bit.ly/4pYbN1Z
October 7, 2025 at 7:15 PM
parkbot.bsky.social
It’s 4:15 am here and after four attempts over the span of a month I finally completed my language test. It is now time for dog snuggles.
October 4, 2025 at 11:17 AM
parkbot.bsky.social
I wrote my first and maybe only Substack post. This is a follow up to my Colwell post because I found a 2007 technical report by two MS employees who interviewed folks from MS, AMD, and Intel about the history of the transition, and I learned a lot!

computerparkitecture.substack.com/p/the-long-m...
The Long Mode Chronicles
How the World Became x86-64 Inside
computerparkitecture.substack.com
September 22, 2025 at 8:23 PM
parkbot.bsky.social
Love this photo

www.theguardian.com/global-devel...
Protest banner at Incheon airport of a person in a Trump mask wearing an ICE shirt, with a bag of cash and a rifle. The banner reads, “We’re friends! Aren’t we?”
September 12, 2025 at 7:44 PM
parkbot.bsky.social
Hazy skies from wildfires in the Pacific NW
A picture of the hazy skies in metro Vancouver due to wildfires in northern BC
September 5, 2025 at 3:39 AM
parkbot.bsky.social
Is Todd Austin running for office? 😆#TeamLittleEndian
Post by Todd Austin on LinkedIn The TECH NEWS doesn't want to talk about it, but today EVERY computing system-every last one—is LITTLE ENDIAN. In the dark ages of computer architecture, there were big-endian and little-endian architectures, and it was TOTAL CHAOS. Through the leadership of myself and other HIGHLY TALENTED computer architects, it became clear that BIG ENDIAN was a TOTAL DISASTER, confusing, slow, and frankly a disgrace to the world of computing. Eventually, our sage leadership FIXED it, unified it, and made memory systems BEAUTIFUL again. Last year at HotChips, a very famous computer architect came up to me (with tears in their eyes) and said, "Thank you, professor, for bringing peace and harmony to our memory systems." Today everyone knows it: computer architects LOVE little endian. But now l've just learned something SHOCKING-maybe the biggest cover-up in the HISTORY of technology. The INTERNET-yes, the whole thing—is COMPLETELY BIG-ENDIAN! After all the tremendous work we did, shadowy standards committees and so-called networking "experts" quietly locked in BIG-ENDIAN as "network byte order." It's a GLOBAL DARK NET conspiracy designed to undermine our BEAUTIFUL memory systems and to bring back confusion, chaos, and misaligned data. We must now come together ONCE AGAIN TO BRING ORDER TO THE CHAOS. We must END big endian once and for all. We must make the Internet little endian and make it STRONGER than ever before. BIG-ENDIAN is for LOSERS-LITTLE-ENDIAN is for WINNERS. Thank you for your attention to this matter.
September 2, 2025 at 5:52 PM
parkbot.bsky.social
Reading other sources and it seems like UChicago lost $20 million on crypto? 😬😬😬

stanfordreview.org/uchicago-los...
UChicago Lost Money on Crypto, Then Froze Research When Federal Funding Was Cut
While Stanford responded to the federal funding research freeze by halting administrative hiring and protecting research, the University of Chicago panicked. On January 28, hours after the Trump admi...
stanfordreview.org
August 25, 2025 at 1:12 AM
parkbot.bsky.social
I love this post by Todd Austin equating running a kitchen to a modern out of order microprocessor, especially with the inclusion of precise interrupts, prefetch, and power gating.
Todd Austin • • 1st S. Jack Hu Collegiate Professor of CSE at UofM... I am a COMPUTER ARCHITECT, which means I design computers. I was trained at a great school (UW-Madison), and I worked in industry (Intel) before I became a professor (University of Michigan). Despite these rarefied experiences, I first came to know computer architecture in the KITCHEN, working for 4 years first as a COOK. Let me explain. As a cook, you are the control logic of a complex multi-issue machine, which operates with many of the optimizations found in today's CPUs: IN-ORDER FETCH: The meal orders come in-order from the wait staff, and this order must be preserved. OUT-OF-ORDER ISSUE: With a big menu, the latency to cook items will vary greatly, from fast salads to medium-latency burgers to long-latency steaks. Cooks will scan the upcoming orders and "issue" long latency items first, medium later, and short last, to make sure all items finish at roughly the same time. IN-ORDER RETIREMENT: Importantly, the meal orders have to finish IN-ORDER. Wait staff will get very annoyed if any out-of-order completion occurs—no one wants to see the table that sat down after them get their food first! BTW, Tapas restaurants break this rule, which greatly improves the efficiency of their kitchens. What is the computer architecture dual to the tapas restaurant? PREFETCH: Occasionally, someone from the wait staff will run into the kitchen and yell "BUS!" (typically with the same vigor as someone running into a beach bar and yelling "TSUNAMI!"), which means 50+ additional orders are coming to your line. When this happens, you turn on all the stoves and steak burners and start frying staples, etc. CACHING and SPECULATION: Many of the "specials" for the night are pre-cooked and kept in an oven (cache). This is optimizing the common case, since these popular meals take seconds to make. Often, if there are specials left over at the end of the night (mispeculation), they are donated to local food shelters. NON-DETERMINISTIC LATENCY: Efficient architectures try to avoid all non-deterministic latencies, since they stymie schedulers and gum up the works. Kitchens operate the same way: everything is prepped to give deterministic cook times. Once, I put a steak on a grill shared with the short-order cook window. Later, when I checked on my steak, it was gone... I confronted the short-order cook, and he said, "Do you want to fight me for it?" A non-deterministic latency made my line a mess that night! PRECISE INTERRUPTS: When the shift changes, the incoming cook will negotiate which order to transition on. The working cook will finish all their orders, after which the new cook takes over. This is called a precise interrupt, and it is similar to how out-of-order processors effectuate a process switch. POWER GATING: Kitchens are HOT. If stoves are not needed, they are powered down! Besides architecture training, working as a cook is a great way to start a career. All later jobs you will have will be MUCH EASIER and LESS DANGEROUS! #computerarchitecture
August 24, 2025 at 7:15 PM
parkbot.bsky.social
Great interview with my (boss’ boss’ boss’ boss’) boss.

My Lisa story is that in early 2020 we had a buggy driver launch that caused a game to crash repeatedly. I emailed Lisa telling her that the driver was buggy, my horrible experience with Radeon drivers in 2001 made me
laurengoode.bsky.social Lauren Goode @laurengoode.bsky.social · Aug 12
My long-in-the-works Big Interview with AMD chair and CEO Lisa Su is out—and more timely than ever. We talk about export controls, AMD’s growing data center business, AI in healthcare, what drives her (aside from Starbucks & boxing), and of course, competing with Nvidia www.wired.com/story/lisa-s...
Lisa Su Runs AMD—and Is Out for Nvidia’s Blood
While everyone else has been talking about Nvidia’s GPUs, Lisa Su has discreetly turned AMD into a chipmaking phenom. And as the US-China tech war rages, she’s at the center of it all.
www.wired.com
August 13, 2025 at 6:26 PM
parkbot.bsky.social
I’ve lived in Texas, Colorado, Ionho, Nosava, Ilana, and Ventanr.
Asking GPT-5 to draw me a map of the United States GPT-5’s map of the US
August 10, 2025 at 12:12 AM
parkbot.bsky.social
PCIe 8.0 has been announced, so a reminder that since Gen 3, the link transfer rate is 2^(PCIe gen), and from there you can derive the bandwidth for any link width.

e.g. Gen 8 x16 = 256 GT/s * 16 lanes / 8 bits/B * 2 directions = 1024 GB/s = 1 TB/s

www.businesswire.com/news/home/20...
PCIe (bidirectional) bandwidths for various link widths across generations
August 6, 2025 at 12:32 AM
parkbot.bsky.social
Not to brag, but I edit text and clean my apartment with vim
Vim cleaner, not to be confused with the world class text editor
August 1, 2025 at 12:46 AM
Reposted by Phil Park
washingtonpost.com
Gaza faces a severe humanitarian crisis as Israeli restrictions on aid lead to widespread malnutrition and starvation, with hospitals overwhelmed by malnourished children.
Mass starvation stalks Gaza as deaths from hunger rise
Aid agencies warned for months that Israel’s harsh limits on food aid would bring acute malnutrition and widespread suffering to Gaza’s 2.1 million people.
www.washingtonpost.com
July 24, 2025 at 11:30 AM
parkbot.bsky.social
Intel’s Clear Linux distro has shut down 🫡

community.clearlinux.org/t/all-good-t...
All good things come to an end: Shutting down Clear Linux OS
After years of innovation and community collaboration, we’re ending support for Clear Linux OS. Effective immediately, Intel will no longer provide security patches, updates, or maintenance for Clear ...
community.clearlinux.org
July 19, 2025 at 3:46 AM
parkbot.bsky.social
This was another fun trip down memory lane. Magny Cours was the 4th revision of the Barcelona (Greyhound) lineage. I worked on the die-to-die communication link in the MCM package used for control signals like power management.

bsky.app/profile/chip...
chipsandcheese.bsky.social chipsandcheese.bsky.social @chipsandcheese.bsky.social · Jul 11
Hello you fine Internet folks,

Before AMD's Infinity Fabric, AMD's interconnect for high core count CPUs was HyperTransport (HT). Today's article is a retrospective look at the HT used in Magny Cours CPUs.

Hope y'all enjoy!

chipsandcheese.com/p/amds-magny...
old.chipsandcheese.com/2025/07/11/a...
AMD’s Magny Cours and HyperTransport Interconnect: A High Core Count Blast from the Past
Today, we’re used to desktop processors with 16 or more cores, and several times that in server CPUs.
chipsandcheese.com
July 15, 2025 at 4:43 PM
Reposted by Phil Park
junlper.beer
you’re telling me republicans are now going to call democrats communists since zohran won? they’ve never done that before it might be over
June 25, 2025 at 3:37 PM
parkbot.bsky.social
This is a cool read into the past during the early days of our CPU/GPU integration efforts. If you compare block diagrams you can see the lineage from the Unified North Bridge (UNB) to Infinity Fabric.

open.substack.com/pub/chipsand...
AMD’s Pre-Zen Interconnect: Testing Trinity’s Northbridge
Today, AMD’s Infinity Fabric interconnect is ubiquitous across the company’s lineup.
open.substack.com
June 15, 2025 at 9:12 PM
parkbot.bsky.social
I needed IT to fix my laptop, so I got to visit the AMD Vancouver campus
AMD building entrance Sign showing the companies at the 2930/2940 Broadway Tech Centre: BCLC, Worley, Worley Chemetics, Worley Consulting, and AMD Green area of the campus
June 6, 2025 at 4:13 PM
parkbot.bsky.social
White paper on the UALink 200G v1.0 spec by Nathan Kalyanasundharam

ualinkconsortium.org/wp-content/u...
UALink features and goals
June 5, 2025 at 11:52 PM
parkbot.bsky.social
I was explaining Little’s Law to my intern today when I used Netflix to illustrate an example.

Me: “Do you remember when Netflix used to mail DVDs?”

Intern: “Uhh, no. I think that was before I was born.”

Me:
patrick star from spongebob squarepants holding a piece of puzzle
Alt: patrick star from spongebob squarepants aging rapidly
media.tenor.com
June 3, 2025 at 12:35 AM
parkbot.bsky.social
This sounded like something @srasgon.bsky.social would say, and it turns out it was.

ca.investing.com/news/transcr...
Stacy Rasgon, Analyst, Bernstein: a smaller wafer size. Got it. Got it. I guess along those lines, like, does China fit into all of this? And and and, clearly, you guys have been impacted by sort of increasing waves of export controls, which have not been all that fun. China was still buying a lot of especially those kinds of of of tools. Sometimes it's it's unclear to me who's actually doing the buying in China. I guess just how do we think about the general environment in China, the geopolitical situation? I always worry, like, what's the risk of further export controls? I mean, could could our, you know, our new president wake up one morning and, you know, after eating a bad burrito or something and decide to to cut everything off. I mean, this is something I I wish I don't think it's likely, but I wish I could say I thought that risk was non zero, and I'm not sure that it is. So, like, how does how does Lem think about those kinds of risks?
June 1, 2025 at 3:02 AM
parkbot.bsky.social
Going through photo archives and I forgot how gorgeous my ex-gf’s cat was with his heterochromia. #cats #catsky #catsofbluesky
My ex’s cat Samran and his beautiful eyes Sammy chilling in an empty HEB water pack Sammy and Frff. RIP to both of them
May 16, 2025 at 3:30 PM