Intel CPU performance-loss by security-patch?!?

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syzygy
Posts: 4450
Joined: Tue Feb 28, 2012 10:56 pm

Re: Intel CPU performance-loss by security-patch?!?

Post by syzygy » Wed Jan 10, 2018 12:20 am

APassionForCriminalJustic wrote:
Jouni wrote:I see now, that SF8 bench is always below 2 Mnps previuosly it was about 2 100 000 (Corei5) if I recall correctly so 5% slower :( .
Is this patch really necessary? I mean - is someone really going to hack a personal PC? Doesn't seem worth any performance loss...
The meltdown vulnerabiltiy of Intel processors is a very serious problem unless you're not connected to the internet and don't run any untrusted software. I'm sure it is already being exploited.

Paloma
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Joined: Thu Dec 25, 2008 8:07 pm

Re: Intel CPU performance-loss by security-patch?!?

Post by Paloma » Wed Jan 10, 2018 2:45 am

Where is this patch?
I have not yet been offered it by Mircosoft update ?!

Win 7 prof

syzygy
Posts: 4450
Joined: Tue Feb 28, 2012 10:56 pm

Re: Intel CPU performance-loss by security-patch?!?

Post by syzygy » Wed Jan 10, 2018 7:01 am

Paloma wrote:Where is this patch?
I have not yet been offered it by Mircosoft update ?!

Win 7 prof
I'm not sure, but you may have received it already in December or November.

syzygy
Posts: 4450
Joined: Tue Feb 28, 2012 10:56 pm

Re: Intel CPU performance-loss by security-patch?!?

Post by syzygy » Wed Jan 10, 2018 7:04 am

syzygy wrote:
Paloma wrote:Where is this patch?
I have not yet been offered it by Mircosoft update ?!

Win 7 prof
I'm not sure, but you may have received it already in December or November.
Hmm, maybe not:
https://www.pcworld.com/article/3245810 ... flaws.html

Jouni
Posts: 1979
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Re: Intel CPU performance-loss by security-patch?!?

Post by Jouni » Wed Jan 10, 2018 8:25 am

I found same bencmarks from June 2017 and after that no slowdown visible even there are some kind of Windows 10 update almost every day.
Jouni

Joost Buijs
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Location: Almere, The Netherlands

Re: Intel CPU performance-loss by security-patch?!?

Post by Joost Buijs » Wed Jan 10, 2018 8:59 am

Microsoft released some information about Meltdown and Spectre, only the fix for Spectre variant 2 'Branch Target Injection' seems to have a significant impact on performance depending on processor type and OS. This fix also needs a microcode update (via a bios update) before it can or will be enabled.

https://cloudblogs.microsoft.com/micros ... s-systems/

Paloma
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Joined: Thu Dec 25, 2008 8:07 pm

Re: Intel CPU performance-loss by security-patch?!?

Post by Paloma » Wed Jan 10, 2018 9:14 am

how did you handle that problem with your pc?

Michel
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Re: Intel CPU performance-loss by security-patch?!?

Post by Michel » Wed Jan 10, 2018 12:29 pm

The following link give a very readable explanation of the bugs and how the exploits work

https://blog.cloudflare.com/meltdown-sp ... technical/
Ideas=science. Simplification=engineering.
Without ideas there is nothing to simplify.

kasinp
Posts: 188
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Location: Toronto

Re: Intel CPU performance-loss by security-patch?!?

Post by kasinp » Wed Jan 10, 2018 12:44 pm

Michel wrote:The following link give a very readable explanation of the bugs and how the exploits work

https://blog.cloudflare.com/meltdown-sp ... technical/
Thanks for the link. I have read and still have the same fundamental question about the nature of the attack, and therefore, about the ways to prevent it:

The men in black, or the exploiting code: would that not have to be some kind of malware running on my computer? And if so, why should I not expect that anti-malware software should be able to detect and prevent it? If not today, then at some point when anti-malware developers catch up to it.

Peter

Milos
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Re: Intel CPU performance-loss by security-patch?!?

Post by Milos » Wed Jan 10, 2018 12:56 pm

kasinp wrote:The men in black, or the exploiting code: would that not have to be some kind of malware running on my computer? And if so, why should I not expect that anti-malware software should be able to detect and prevent it? If not today, then at some point when anti-malware developers catch up to it.
Peter
Yes it would have to be a malware, but problem is thanks to the general nature of exploit knowing how the exploit work would make it very easy to write millions of version of the malware that would all have different signatures effectively making it impossible for anti-malware developers to catch up to it.

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