[Various] Spectre & Meltdown: Critical vulnerabilities in modern processors - Page 2 - Overclock.net - An Overclocking Community

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[Various] Spectre & Meltdown: Critical vulnerabilities in modern processors

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post #11 of 1852 (permalink) Old 01-02-2018, 12:49 PM
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I'm assuming that the patched OSes will automatically choose the best path for AMD CPUs, or in other words, apply this (or equivalent in Windows) automatically:

Unless Intel decides to grease some palms to ensure the AMD CPUs are also flagged for the instruction so that they also get hit with the performance decrease.

That would last for about half a day, at best. The complaints would be so numerous and so loud that Intel would stop before it began.

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post #12 of 1852 (permalink) Old 01-02-2018, 12:49 PM
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thats a sign of one of three possibilities.

1) Intel's CEO is planning to leave
2) Intel's CEO is expecting some awful news to affect intel's stock in a bad bad way. (remember Equifax? their whole board of directors withheld the news about the hack so they could divest themselves from the company, once they were divested they released the news about the hack). I would expect company affecting bad news to result in most of the directors divesting, not just the CEO; so unless the rest of intel's directors also recently sold off shares, then this probably isn't why he's selling.
3) Intel's CEO wants to invest in something else, or needs a lot of liquid assets for some reason (this is unlikely unless he plans to buy or massively invest in a company; or he's going to be sat on the board of another company and that company has share requirements to be seated... this is more common then you'd expect)

I don't like your hypothesis.
1) he's leaving - does he really needs to sell share / keep the bare minimum for that?
2) and 3) pretty much the same - bad stock performance.

I've heard the rise of silicon pricing, not sure how this is affecting Intel considering that they probably make their own ingot. I like to think tech stock will perform poorly due to rising production and R&D cost.

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post #13 of 1852 (permalink) Old 01-02-2018, 12:55 PM
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2 and 3 aren't the same thing at all

Lots of corporate officers hold seats on multiple companies. It's really inbred that way. I would not be surprised at all if he was being added to the board of another company; one which requires a min percentage of ownership. Look it up, I wouldn't be surprised to learn he's already on several corporate boards already.

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post #14 of 1852 (permalink) Old 01-02-2018, 01:11 PM
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setup_force_cpu_bug(X86_BUG_CPU_INSECURE);"
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post #15 of 1852 (permalink) Old 01-02-2018, 01:26 PM
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post #16 of 1852 (permalink) Old 01-02-2018, 01:27 PM
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post #17 of 1852 (permalink) Old 01-02-2018, 01:30 PM
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They wouldn't need it anyway because a major selling point on Epyc is per-VM hardware memory encryption. I can steal a book from someone all I want, but if I can't read the language then it doesn't do me much good, does it?

Boy I bet that marketing line is being taken a lot more seriously now. tongue.gif

I know, but my point is that *THEY* also knew it, and yet included something so completely stupid in the article. This is so inflammatory it's at honest-to-god shill level. Intel didn't even need to PAY for this kind of negative association.

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Yeah, they should have included results from an Intel CPU so we could see what the performance impact is. Bringing AMD into the discussion when it's not affected seems pointless to say the least.

Well, at least they went on to clarify and quote someone from AMD saying that it doesn't apply to AMD CPUs and I'm assuming that the patched OSes will automatically choose the best path for AMD CPUs, or in other words, apply this (or equivalent in Windows) automatically:
https://lkml.org/lkml/2017/12/27/2


Now I really want to see what the performance impact on Intel CPUs is going to be. From 5% to 49% is a big gap and we need to know the usage scenarios to see if this is a big issue or not. If a 49% impact is only on exotic workloads, Intel will get away with it, but a more general scenario could (I never thought I'd say this) actually break them. Even if 5% performance impact is what will happen in most cases, that means that the IPC advantage Intel has over AMD right now is going to be mostly wiped out.

Pointless, ha. This might be a somewhat rare exception to Hanlon's razor. They should immediately remove the tweet and any reference to the 49% number as the *HARDWARE* already provides this security. Any retraction of the AMD numbers should be replaced by the worst case scenario of Intel's numbers.


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post #18 of 1852 (permalink) Old 01-02-2018, 01:41 PM
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post #19 of 1852 (permalink) Old 01-02-2018, 01:41 PM
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Yeah, they should have included results from an Intel CPU so we could see what the performance impact is. Bringing AMD into the discussion when it's not affected seems pointless to say the least.

Well, at least they went on to clarify and quote someone from AMD saying that it doesn't apply to AMD CPUs and I'm assuming that the patched OSes will automatically choose the best path for AMD CPUs, or in other words, apply this (or equivalent in Windows) automatically:
https://lkml.org/lkml/2017/12/27/2


Now I really want to see what the performance impact on Intel CPUs is going to be. From 5% to 49% is a big gap and we need to know the usage scenarios to see if this is a big issue or not. If a 49% impact is only on exotic workloads, Intel will get away with it, but a more general scenario could (I never thought I'd say this) actually break them. Even if 5% performance impact is what will happen in most cases, that means that the IPC advantage Intel has over AMD right now is going to be mostly wiped out.

Pointless, ha. This might be a somewhat rare exception to Hanlon's razor. They should immediately remove the tweet and any reference to the 49% number as the *HARDWARE* already provides this security. Any retraction of the AMD numbers should be replaced by the worst case scenario of Intel's numbers.

I agree with them posting Intel numbers.

When it comes to AMD, that part has perhaps the unintended consequence that people will know that something happened behind the scenes if AMD CPUs also degrade in performance when they shouldn't.

The correct way to post that story would be:

1. Here are the Intel numbers;
2. Here are the AMD numbers if something behind the scenes happens.

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post #20 of 1852 (permalink) Old 01-02-2018, 01:56 PM
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I agree with them posting Intel numbers.

When it comes to AMD, that part has perhaps the unintended consequence that people will know that something happened behind the scenes if AMD CPUs also degrade in performance when they shouldn't.

The correct way to post that story would be:

1. Here are the Intel numbers;
2. Here are the AMD numbers if something behind the scenes happens.

I disagree completely with any association with AMD. This is disclosed and referenced as a solely *INTEL* bug. If at any point in the future something in this affects AMD directly somehow, then and *ONLY* then do they even get mentioned. The only exception being the statement AMD is unaffected by this bug and has no performance impact.

This legitimately may make EPYC superior in performance to intel, not just better PPD. The new normal is to compare AMD throughput on all tasks to Intel's new throughput when the fixes are released to all kernels.


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