News for hackers. Stuff that matters.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by MBCook on Friday October 07, 2022 @11:06PM (#33129460)
“As for why the Ryzen 7000 series performance is actually slower if disabling the Spectre V2 mitigations, that's likely something only AMD can effectively answer but presumably…”

Just ask!

Seriously. You can ask AMD. Maybe they won’t tell you, but they might. It might be really good info. Why not ask someone who is really knowledgeable about this stuff like a kernel developer who works on x86-64 or worked on the mitigations?

This is what I never understand about Phoronix. People link to them all the time but they run a bunch of benchmarks and then end on “there you go”. I’d like investigation into why. You won’t always get an answer but you should try.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by theow7384iri on Saturday October 08, 2022 @12:50AM (#33129852)
I don't think Phoronix has time and budget for that. It is a single man, a few scripts and heavy automation. Sometimes he founds bugs and reports it, but there is no time to follow such rabbit hole!
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by getcrunk on Saturday October 08, 2022 @01:26AM (#33129998)
if anything, industry should reach out to him imo. he has a lot of mind share in the IT community
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by p-e-w on Saturday October 08, 2022 @01:35AM (#33130036)
> Seriously. You can ask AMD. Maybe they won’t tell you, but they might.

Seriously? By far the most likely outcome is that they don't even bother responding.

That's how corporations operate in 2022. If you're a journalist from the Washington Post, you might get a three-line statement from a spokesperson. Everyone else gets a canned reply from a bot, or nothing at all.

I don't blame Michael for not even bothering to try. Phoronix is the only game in town for much of the topics it covers. The fact that it exists at all, and is effectively run by a single person, is nothing short of amazing.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by worthless-trash on Saturday October 08, 2022 @02:29AM (#33130269)
> That's how corporations operate in 2022. If you're a journalist from the Washington Post, you might get a three-line statement from a spokesperson. Everyone else gets a canned reply from a bot, or nothing at all.

This is not true, I write to AMD security team for spectre/meltdown/CPU flaws and get reasonable responses. Intel security team is also quite good. The usual wait time is 3-4 days.

Admittedly I do write from my work address.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by p-e-w on Saturday October 08, 2022 @02:40AM (#33130310)
That's great, but I suspect the address you write from indeed plays a big part here. Direct responses from engineers of that caliber within a matter of days is most certainly not standard.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by throwawaybutwhy on Sunday October 09, 2022 @05:18AM (#33139326)
Probably somewhere in A.A. County.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by stingraycharles on Saturday October 08, 2022 @03:32AM (#33130522)
What’s your work, out of curiosity? I suppose security researcher?
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by worthless-trash on Tuesday October 11, 2022 @09:03PM (#33171411)
Red Hat Kernel security team.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by inglor on Saturday October 08, 2022 @05:14AM (#33130910)
I answer engineers from other companies all the time but never answer journalists. Engineers give a vibe of “cares about what you do and wants to collaborate”.

Talking to journalists is like talking to the police - as an engineer you don’t understand the situation well enough and you need to involve an (expensive) professional to navigate it.

The question going through my head when I get journalist emails is “can I ignore this and save the hours of work with legal/pr?”.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by spookie on Saturday October 08, 2022 @07:50AM (#33131543)
True that
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by marcosdumay on Saturday October 08, 2022 @12:17PM (#33133546)
On most places only the PR team is even allowed to talk to journalists. Exactly because that "is like talking to the police" issue.

It's a very sensible and correct policy.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by worthless-trash on Tuesday October 11, 2022 @09:02PM (#33171404)
Thats a good point, I had never thought of that.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by TheRealPomax on Saturday October 08, 2022 @02:44AM (#33130327)
> By far the most likely outcome is that they don't even bother responding

So, "likely" the same outcome as when you don't ask, except unlike when you don't ask, there is a different outcome when you do ask? Sounds like you just made the argument in favour of always asking questions.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by Blikkentrekker on Saturday October 08, 2022 @07:45AM (#33131521)
Under the assumption that time is not valuable. Writing such an email is still an investment of time.
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by albertopv on Saturday October 08, 2022 @01:50AM (#33130115)
Phoronix is a one man show literally doing everything: hw managemen, tests, articles, news reports, forum admin, premium users management...
Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by hericium on Saturday October 08, 2022 @05:07AM (#33130893)
> Just ask! Seriously. You can ask AMD.

But it's Phoronix - short reprints, not well-done benchmarks, 1-3 paragraphs long "articles" and backlink spam on forums, wikis and wherever possible. They may ask AMD but that will be another "article" and another wave of spam.

Re:AMD Ryzen 7000 Series performs better with Spectre V2 Mit... by woliveirajr on Saturday October 08, 2022 @06:36AM (#33131216)
Remembers me about the 'supercow powers" question at StackOverflow (unixStackExchange): everybody just guessing, I dared to ask Jason Gunthorpe and he didn't answer me... he made post about it:

https://web.archive.org/web/20190322061230/https://plus.goog...