Intel CPUs

Zarjazz

Zarjazz

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Jupitus said:
That looks pretty fucking awful ...
Click to expand...

It is. Hell even if it's only a 5% performance impact in real-world benchmarks that's still fucking huge. At least the Linux changes can be disabled at boot time to ensure no servers are impacted. However desktops will almost certainly have to run the fix.
 
BloodOmen

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*laughs in AMD*

Not really, I still have an intel :( I would imagine people will be laughing in AMD though.
 
Raven

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AMD don't appear to have a clue what is going on. Everyone except them is saying it affects AMD too. They are either dumb, outright lying or everyone else is wrong.
 
ECA

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Linus re:intel/amd on this.

On Wed, Jan 3, 2018 at 3:09 PM, Andi Kleen <andi@firstfloor.org> wrote:
> This is a fix for Variant 2 in
> Project Zero: Reading privileged memory with a side-channel
>
> Any speculative indirect calls in the kernel can be tricked
> to execute any kernel code, which may allow side channel
> attacks that can leak arbitrary kernel data.

Why is this all done without any configuration options?

A *competent* CPU engineer would fix this by making sure speculation
doesn't happen across protection domains. Maybe even a L1 I$ that is
keyed by CPL.

I think somebody inside of Intel needs to really take a long hard look
at their CPU's, and actually admit that they have issues instead of
writing PR blurbs that say that everything works as designed.

.. and that really means that all these mitigation patches should be
written with "not all CPU's are crap" in mind.

Or is Intel basically saying "we are committed to selling you shit
forever and ever, and never fixing anything"?

Because if that's the case, maybe we should start looking towards the
ARM64 people more.

Please talk to management. Because I really see exactly two possibibilities:

- Intel never intends to fix anything

OR

- these workarounds should have a way to disable them.

Which of the two is it?

Linus
Click to expand...
 
Wij

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Still in the dark about the AMD yay or nay issue then. Benchmarks will tell the relative performance hit but it will need bigger brains than mine to determine whether this is because they produced a generic fix that nerfed performance for Intel and AMD equally or because they are both equally flawed.
 
Zarjazz

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Wij said:
Still in the dark about the AMD yay or nay issue then.
Click to expand...

Meltdown, Spectre: The password theft bugs at the heart of Intel CPUs

Google Online Security Blog: Today's CPU vulnerability: what you need to know

tl;dr - There are actually several attack methods Google discovered. Intel is affected by them all. The most serious problem doesn't affect AMD and that's the one that's been reported on yesterday and has the performance impact. The other methods AMD is only partially affected by and can be fixed by either microcode updates or simple compiler fixes.
 
old.user4556

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See what happens when you don’t buy a Mac?
 
Wij

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Indeed they are.

Waiting for those benchmarks...
 
old.user4556

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You guys, so easy to get a bite :D, of course Macs are affected. GAYBOYS.
 
Bodhi

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What about DVD Encoding on elderly AMD chips?

Asking for a friend.
 
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