Intel processors are dead, so I have an AMD question

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XenoMind
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11 Jan 2018, 4:50 pm

kokopelli wrote:
Meltdown can be fixed


... essentially by building a stronger wall around the kernel; the technical term is “kernel page table isolation.” This solves the issue, but there’s a cost. Modern CPU architectures assume certain things about the way the kernel works and is accessed, and changing those things means that they won’t be able to operate at full capacity.

Your own quote, and you obviously didn't read it well.



Aristophanes
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11 Jan 2018, 6:38 pm

As a user of both AMD and Intel processors over the years let me arbitrate this dispute: both companies have crappy processors...depending on the generation we're talking about. Same can be said of ATI vs Nvidia. Or every hard drive manufacturer, MB manufacturer, etc. Buy PC parts based on the performance and reliability of the components, no one company has the entire industry cornered in those regards, so don't buy based off of who's logo is on them.



MagicKnight
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12 Jan 2018, 7:54 am

XenoMind wrote:
kokopelli wrote:
Have you actually done serious research on this topic that gives you some special insight?

I see that you didn't.


No, you don't do your research right! You're biased! Here goes the independent research so that everyone can scrub the subject to your face, Zebra Mind! I could spare you the trouble of reading through it by posting the exact excerpt here but since you are so "woke" about the industry I bet you prefer to do it yourself. That's in section 1.4, anyway.

https://spectreattack.com/spectre.pdf



XenoMind
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12 Jan 2018, 11:05 am

MagicKnight wrote:
No, you don't do your research right!

Only Intel CPUs are affected by Meltdown. Period.



MagicKnight
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12 Jan 2018, 11:35 am

XenoMind wrote:
MagicKnight wrote:
No, you don't do your research right!

Only Intel CPUs are affected by Meltdown. Period.


Nevertheless AMD and ARM CPUs are affected by Spectre. You don't have all your facts straight. Period.



XenoMind
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12 Jan 2018, 11:47 am

MagicKnight wrote:
Nevertheless AMD and ARM CPUs are affected by Spectre.

That doesn't really mater, because having one severe vulnerability less is still having one severe vulnerability less.



MagicKnight
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12 Jan 2018, 12:24 pm

XenoMind wrote:
MagicKnight wrote:
Nevertheless AMD and ARM CPUs are affected by Spectre.

That doesn't really mater, because having one severe vulnerability less is still having one severe vulnerability less.


Hey listen, the voice of reason has spoken! LOL! Your last statement shows the much you don't get your facts right. You live inside your wonderland bubble where whatever you believe is right should be deemed right by everyone else.

That really does matter because A. there's still a serious, inescapable vulnerability B. Spectre CAN HARDLY BE FIXED. That's all documented, you obnoxious piece of circus comedy.



XenoMind
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12 Jan 2018, 12:36 pm

MagicKnight wrote:
the voice of reason has spoken! LOL!

That was very funny, indeed.



MagicKnight
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12 Jan 2018, 1:14 pm

XenoMind wrote:
MagicKnight wrote:
the voice of reason has spoken! LOL!

That was very funny, indeed.


I'm not giving you the benefit of the last word, Silly Mind! That's not the correct reply. The right statatement would be "I XenoMind am completely wrong and acknowledge my sheer inferiority because I have no social skills even among the most autistic people, I can't reason as a civilised human being and feel superior to everyone else just because I regard myself as such. I deserve to be humiliated and all the shame my family, peers and useless existence cast upon me."

You think you're the scientist type, you foockin' Kanye West? I'm not leaving you alone. I require your deepest apologies for what you said of me here.



Last edited by MagicKnight on 12 Jan 2018, 1:50 pm, edited 1 time in total.

XenoMind
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12 Jan 2018, 1:16 pm

MagicKnight wrote:
I'm not giving you the benefit of the last word, Silly Mind! That's not the correct reply. The right statatement would be "I XenoMind am completely wrong and acknowledge my sheer inferiority because I have no social skills even among the most autistic people, I can't reason as a civilised human being and feel superior to everyone else just because I regard myself as such. I deserve to be humiliated and all the shame my family, peers and useless existence cast upon me."

You think you're the scientist type, you foockin' Kanye West? I'm not leaving you alone. I require your most deep apologies for what you said of me here.

Your arrogance is only seconded by your ignorance.



MagicKnight
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12 Jan 2018, 1:29 pm

XenoMind wrote:
Your arrogance is only seconded by your ignorance.


You're wrong again. Your arrogance predates any arrogance plus you have no rights to talk about ignorance from what you just showed everyone here. You just showed us the sad pathetic figure you really are, sat on an invisible throne on a non-existent mountain.

Your statements are becoming shorter and shorter. What's next? You'll be writing in monosyllables?

Otherwise, show me how deeply sorry you are for what you said of me and choose your best words to address your peers next time.



Ichinin
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13 Jan 2018, 11:42 am

MagicKnight wrote:

You're wrong again. Your arrogance predates any arrogance plus you have no rights to talk about ignorance from what you just showed everyone here. You just showed us the sad pathetic figure you really are, sat on an invisible throne on a non-existent mountain.

Your statements are becoming shorter and shorter. What's next? You'll be writing in monosyllables?

Otherwise, show me how deeply sorry you are for what you said of me and choose your best words to address your peers next time.


Just learn to ignore trolls, it will save you the mental stress and anguish. Myself i have enough experience and SANS training to feel comfortable in my skill set and don't give a flying crap what he says.


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kokopelli
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13 Jan 2018, 6:49 pm

XenoMind wrote:
MagicKnight wrote:
No, you don't do your research right!

Only Intel CPUs are affected by Meltdown. Period.


Nope. It reportedly affects IBM Power processors and some ARM processors as well.

As for AMD processors, they have not been shown to be vulnerable to Meltdown which leads to an assumption that they are not. Nobody can say for sure that they aren't vulnerable to Meltdown.



Tollorin
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13 Jan 2018, 11:54 pm

The three main home video game consoles use AMD processors. (PS4, XBox One and Nintendo Switch)
The problem is that big budget consoles games are generally designed to pushing consoles to their limits, meaning that any slow down, like a patch for the Spectre bug, could potentially seriously slow down the games. Don't know for sure how the things could play out.


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Aristophanes
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15 Jan 2018, 9:34 am

Intel Benchmarks for Sky, Kaby, and Coffee lake processors after Meltdown patch compared to unpatched performance.

I run an i5 Skylake, patched it on Saturday (reformatted and did a fresh install of Windows 10 too), and I tested some rendering. In the Angular project I'm currently working on compile time increased from 14.892 seconds to 15.266 (averaged, did 10 compiles before patch, 10 after) or about a 2.5% decrease in performance. I also re-encoded a tv episode (3x only on this test because it's longer), it took 328 seconds before patch 341 seconds post patch or approximately a 4% decrease in performance. So not much to write home about, it still outperforms it's AMD equivalent from that generation on tasks I do by about 9%.

I suspect the slowdown would be significant if I ran a relational database and did a series of transactions from multiple accounts-- that's where speculative execution (what the patch changed) is most likely to be utilized by the cpu. If you're not running a server database the patch for Meltdown will be imperceptible. Basically if you're a home user, or ever power user with a modern Intel processor you have nothing to worry about, if you're an IT professional and your company runs large databases or cloud infrastructure on Intel then you're in for a nightmare.



kokopelli
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15 Jan 2018, 12:06 pm

Bruce Schneier wrote about the vulnerability. Some highlights:

Quote:
Patching against Meltdown can degrade performance by almost a third. And there's no patch for Spectre; the microprocessors have to be redesigned to prevent the attack, and that will take years.

This is bad, but expect it more and more. Several trends are converging in a way that makes our current system of patching security vulnerabilities harder to implement.

The first is that these vulnerabilities affect embedded computers in consumer devices. Unlike our computers and phones, these systems are designed and produced at a lower profit margin with less engineering expertise. There aren't security teams on call to write patches, and there often aren't mechanisms to push patches onto the devices. We're already seeing this with home routers, digital video recorders, and webcams. The vulnerability that allowed them to be taken over by the Mirai botnet last August simply can't be fixed.


...

The final reason is the nature of these vulnerabilities themselves. These aren't normal software vulnerabilities, where a patch fixes the problem and everyone can move on. These vulnerabilities are in the fundamentals of how the microprocessor operates.

It shouldn't be surprising that microprocessor designers have been building insecure hardware for 20 years. What's surprising is that it took 20 years to discover it. In their rush to make computers faster, they weren't thinking about security. They didn't have the expertise to find these vulnerabilities. And those who did were too busy finding normal software vulnerabilities to examine microprocessors. Security researchers are starting to look more closely at these systems, so expect to hear about more vulnerabilities along these lines.

Spectre and Meltdown are pretty catastrophic vulnerabilities, but they only affect the confidentiality of data. Now that they -- and the research into the Intel ME vulnerability -- have shown researchers where to look, more is coming -- and what they'll find will be worse than either Spectre or Meltdown. There will be vulnerabilities that will allow attackers to manipulate or delete data across processes, potentially fatal in the computers controlling our cars or implanted medical devices. These will be similarly impossible to fix, and the only strategy will be to throw our devices away and buy new ones.