Almost a fifth of cancer cases worldwide are caused by a chronic infection. Most of these infections are viruses.

Intel Bug: Fix is about to slow down machines up to 30%
#1
Quote:A fundamental design flaw in Intel's processor chips has forced a significant redesign of the Linux and Windows kernels to defang the chip-level security bug.
Programmers are scrambling to overhaul the open-source Linux kernel's virtual memory system. Meanwhile, Microsoft is expected to publicly introduce the necessary changes to its Windows operating system in an upcoming Patch Tuesday: these changes were seeded to beta testers running fast-ring Windows Insider builds in November and December.
Crucially, these updates to both Linux and Windows will incur a performance hit on Intel products. The effects are still being benchmarked, however we're looking at a ballpark figure of five to 30 per cent slow down, depending on the task and the processor model. More recent Intel chips have features – such as PCID – to reduce the performance hit
https://www.phoronix.com/scan.php?page=a...6pti&num=2
https://www.theregister.co.uk/2018/01/02...sign_flaw/


Well then. Looking at Zen+ anyone?
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#2
Some more information on this:

It affects system calls only. when you visit a website code could be executed that reads all the information off the internal caches. The fix is to clear out the caches before taking the next system call... (along those lines)

Computer games do not make very many system calls at all so that market would not be affected much. https://www.phoronix.com/forums/forum/ph...post998726

For lots of system calls though, like large databases, in some cases 2x slower? donno what the upper limit is, just pretty much everything that depends on system calls is 30% slower. I've heard that rebuilding a RAID array being 4x slower.

Here are some initial benchmarks:
https://www.phoronix.com/scan.php?page=a...6pti&num=2

[edit]
forgot to mention that the people pushing the hardest for the fixes are large companies with lots and lots of virtual machines.
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#3
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#4
The most important question though...How will it affect folding?
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#5
This is insane, the reasons just keep piling up to switch on over to Ryzen, I'm super hyped to see what zen+ brings to the table.

As for intel...

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I hope this won't affect resale value xP
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#6
If I had to guess, it would not affect folding@home much... I don't think it makes very many system calls and the whole thing can practically fit inside of cache.
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#7
Good news! The details are out, and everyone is affected to some degree. Intel, ARM, AMD, you name it. If you do speculative execution, you're in trouble.

AMD appears to not be vulnerable to the most significant of the issues (Meltdown), but is definitely vulnerable to the other one (Spectre). Intel and ARM appear to be vulnerable to both.

Have fun!
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#8
Yes, there are two exploits.
Spectre: https://spectreattack.com/spectre.pdf
Meltdown: https://meltdownattack.com/meltdown.pdf

Spectre affects all processors that are out-of-order execution. This includes ARM, Power, AMD, Intel, and others...
Meltdown affects all intel processors that are out-of-order execution. Intel's first out-of-order processor was at the end of 1995 with the pentium pro.

There is no fix for Spectre other than application-level work arounds. What Spectre does is "...[allow] access to the victim’s memory and registers, and can perform operations with measurable side effects." As far as I can tell, Spectre can "only" read memory at the same user-level.

Meltdown is the one that allows root access from code execution at any level, including inside of virtual machines. This is what major hosting providers were pushing a fix for, and what causes the slowdown in IO operations in intel hardware with the proper fix. The Meltdown fix does not fix the Spectre issue.

Linus' comment to intel about Meltdown: https://lkml.org/lkml/2018/1/3/797
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#9
Meltdown also applies to the ARM Cortex-A75, which will probably be a mainstay of 2018 Android phones. It does not apply to earlier ARM processors, though.
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#10
Linus Torvalds' thoughts: https://lkml.org/lkml/2018/1/3/797  Ajsleepy
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#11
(2018-01-03, 07:57:57 PM)Deltalizer Wrote: This is insane, the reasons just keep piling up to switch on over to Ryzen, I'm super hyped to see what zen+ brings to the table.

As for intel...

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I hope this won't affect resale value xP

i got ryzen there bugs and allot of things arent optimazed i have samsung 960 evo 500 it wont give me boost button becuase it not intel
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#12
https://www.phoronix.com/forums/forum/ph...post999901
Quote:The real slowdown comes after applying the Intel KPTI OS patch and the new Intel Microcode that goes along with it which makes the branch predictor in Intel CPU's significantly less aggressive. Techspot shows that the combination of the two has a more significant impact on system performance (gaming included): https://www.techspot.com/article/1556-me...e-windows/

Michael, the new Intel microcode should be available from Asus for their 370 MB as a BIOS update.

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#13
Ouch D:
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#14
So as long as the BIOS update isn't done, the performance hit shouldn't be that bad. I can live with that. Most people won't bother with it anyway.
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#15
(2018-01-09, 01:03:07 PM)hiigaran Wrote: So as long as the BIOS update isn't done, the performance hit shouldn't be that bad. I can live with that. Most people won't bother with it anyway.

My motherboard has been unsupported since 2012... I guess this means I'm "safe."   Pinkiecrazy
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