Computers & Electronics

Intel processors will take 5-30% performance hit (Windows/Linux) to fix kernel security bug

  • Last Updated:
  • Oct 20th, 2018 10:27 am
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Jul 3, 2017
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Intel processors will take 5-30% performance hit (Windows/Linux) to fix kernel security bug

http://www.theregister.co.uk/2018/01/02 ... sign_flaw/

Testers have discovered a bad hardware security flaw in Intel processors that will require a major change to protected-kernel operating systems including Windows and Linux. Unfortunately the change will come with a big performance penalty. The problem was discovered months ago, but has been kept under wraps while patches were tested.

"Microsoft is expected to publicly introduce necessary changes to its Windows operating system in this month's 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 to reduce the performance hit."

This is worse than Apple's battery performance slowdown! Time for a class-action lawsuit - I want 5-30% of my money back on the price of the Intel processor!

More: https://www.newscientist.com/article/co ... -chip-bug/
Last edited by Exp315 on Jan 2nd, 2018 3:12 pm, edited 2 times in total.
504 replies
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Nov 17, 2004
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Rumor is now that the old AMD crapdozer CPUs are actually faster than it's intel counterpart post patch.
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The interesting part is that newer AMD cpu is now 30% faster than Intel as it is not affected by this.
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Ceryx wrote:
Jan 3rd, 2018 6:52 am
The interesting part is that newer AMD cpu is now 30% faster than Intel as it is not affected by this.
Phoronix has been testing the patch:

https://openbenchmarking.org/result/180 ... INUX415P58

A number of applications/benchmarks (encoding, gaming, Linxu kernel compilation, web serving) aren't affected. An 8700K looks like it'll remain by far the best balanced high-performance CPU that a consumer can buy.
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Jan 10, 2017
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Newer Intel CPUs will be less affected by this as there are other hardware acceleration to reduce performance drops to the patches.
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Fernando Po
No class action lawsuit? Oh wait, I'm a shareholder, never mind. ;)
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Sep 28, 2015
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I guess an upgrade supercycle is coming once Intel has a hardware fix in new gen CPU?
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warmdeals wrote:
Jan 3rd, 2018 10:57 am
I guess an upgrade supercycle is coming once Intel has a hardware fix in new gen CPU?
Now 30% faster than previous gen!
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So did AMD's stock price shoot up? ;)
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Ceryx wrote:
Jan 3rd, 2018 6:52 am
The interesting part is that newer AMD cpu is now 30% faster than Intel as it is not affected by this.
While the AMD CPUs are not affected by the bug, sadly they are also slowed down by the patch to fix it. So no, the AMD CPUs are not 30% faster, unless someone makes a proper fix that leaves the AMD CPUs alone.
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SickBeast wrote:
Jan 3rd, 2018 11:17 am
While the AMD CPUs are not affected by the bug, sadly they are also slowed down by the patch to fix it. So no, the AMD CPUs are not 30% faster, unless someone makes a proper fix that leaves the AMD CPUs alone.
Actually TPU's source is old late info. Latest info claims the latest Linux merged the changes AMD gave them.
https://www.reddit.com/r/hardware/comme ... t/ds46kfe/
https://www.reddit.com/r/hardware/comme ... e/ds42kks/
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SickBeast wrote:
Jan 3rd, 2018 11:28 am
What about Windows?
I don't think Microsoft will apply the fix without looking at vendor ID.
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Ceryx wrote:
Jan 3rd, 2018 11:51 am
I don't think Microsoft will apply the fix without looking at vendor ID.
From what I understand now the Microsoft patch applies the fix to *all* CPUs, AMD and Intel both.
I am a Public Mobile customer.
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SickBeast wrote:
Jan 3rd, 2018 11:54 am
From what I understand now the Microsoft patch applies the fix to *all* CPUs, AMD and Intel both.
Link? I guess you just make it up since you are such an anti-amd fan.

and you do realize that Azure has deployed EPYC, which means they know there is a difference.

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