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Performance impact of Spectre, Meltdown patches on Windows
By Thom Holwerda on 2018-01-09 18:03:36

From Microsoft's blog:

Last week the technology industry and many of our customers learned of new vulnerabilities in the hardware chips that power phones, PCs and servers. We (and others in the industry) had learned of this vulnerability under nondisclosure agreement several months ago and immediately began developing engineering mitigations and updating our cloud infrastructure. In this blog, I'll describe the discovered vulnerabilities as clearly as I can, discuss what customers can do to help keep themselves safe, and share what we've learned so far about performance impacts.

The basic gist here is this: the older your processor and the older your Windows version, the bigger the performance impact will be. Windows 10 users will experience a smaller performance impact than Windows 7 and 8 users, and anyone running Haswell or older processors will experience a bigger impact than users of newer processors.

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Read Comments: 1-10 -- 11-20 -- 21-30 -- 31-39
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RE: More data
By Kochise on 2018-01-09 23:35:32
Obviously it bricks AMD based computers. At least no more attack vector :

https://betanews.com/2018/01/08/m...
Permalink - Score: 1
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RE[5]: Interesting...
By Kochise on 2018-01-09 23:38:17
They not "rushed" the patch, they're working on it since last june, when the bug was found.
Permalink - Score: 1
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RE[6]: Interesting...
By kwan_e on 2018-01-09 23:48:54
> I know it's not going to happen because reasons, but I often wish we could re-architect our systems and come up with better standards, given what we know now in hindsight. It would simplify CPUs and operating systems greatly to get a fresh start without all the legacy baggage.

You mean like with the T2 coprocessor?
Permalink - Score: 2
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Comment by raom
By raom on 2018-01-10 00:39:38
So, is KPTI (or whatever the microsoft equivalent is called) now enabled by default on Windows systems with AMD processors? There's not a single mention of AMD in the blog post.
Permalink - Score: 2
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linux benchies phoronix
By bnolsen on 2018-01-10 00:44:06
There's tons of benchmarks for linux on phoronix. So far they show a fairly uniform performance hit across the cpus tested, ivy bridge up through whatever is newest in some of his testing.
Permalink - Score: 3
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RE: More data
By moondevil on 2018-01-10 07:03:42
> Indirection is a crucial component of many object oriented languages like C++, disabling it shouldn't effect windows and linux that much

Windows has been migrating to C++ since Windows 8, after Longhorn's failure COM took the OO ideas behind it, and it became the foundation of WinRT and .NET Native.

As of Vista, Visual C++ can target kernel code as well.

C compatibility on Windows is basically left to whatever is required from ANSI C++
Permalink - Score: 3
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Disable KPTI
By Sauron on 2018-01-10 08:56:58
On Linux you can disable the patch by using the nopti or pti=no boot parameter, is there a way to do the same with Windows?
Most normal users wouldn't even need to protect against these flaws unless they were extremely paranoid, it's just panic stations at the moment because of it all!
Permalink - Score: 2
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RE[6]: Interesting...
By The123king on 2018-01-10 09:41:56
If they've had 6 months to test it, it shouldn't be bricking computers...
Permalink - Score: 0
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RE: Disable KPTI
By The123king on 2018-01-10 09:43:54
Most normal people wouldn't even need to lock their doors unless they were extremely paranoid, it's just panic stations because there's a burglar on the loose!
Permalink - Score: 1
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RE: More data
By Lennie on 2018-01-10 11:13:59
Why did I get the idea Microsoft is making Windows 7 and 8 slower on purpose to make sure people move to Windows 10.

Why would Windows 7 or 8 be slower than Windows 10 for this ?

That is the part 1 I did not see addressed in the blog post.

Part 2 is: are they enabling that for all CPUs or all x86/AMD64 CPUs or only Intel CPUs ?

Edited 2018-01-10 11:16 UTC
Permalink - Score: 2

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