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-   -   [TH] New AMD Side Channel Attacks Discovered, Impacts Zen Architecture (https://www.overclock.net/forum/225-hardware-news/1743498-th-new-amd-side-channel-attacks-discovered-impacts-zen-architecture.html)

miklkit 03-10-2020 02:40 PM

Quote:

Originally Posted by WannaBeOCer (Post 28360710)
Performance has gone up with later microcode updates. To address the large performance hit with the meltdown patches. I update my own using UBU since motherboard manufacturers are slow. Currently DA is the latest for CoffeeLake.

All CPUs affected by Spectre v1 were hit with some sort of performance penalty.


It was very random and had to do with the intel fixes. Now that it has settled down CPU performance is back to where it was in December 2017 and GPU performance is the best it has ever been.

rdr09 03-12-2020 12:00 AM

Quote:

Originally Posted by WannaBeOCer (Post 28360710)
Performance has gone up with later microcode updates. To address the large performance hit with the meltdown patches. I update my own using UBU since motherboard manufacturers are slow. Currently DA is the latest for CoffeeLake.

All CPUs affected by Spectre v1 were hit with some sort of performance penalty.

The greatest performance hit to fully mitigate from the likes of Zombieload is disabling Hyper-threading. However, Cacheout that affects intel cpus, discovered earlier this year similar to this vulnerability bypasses other mitigations and does not have a permanent fix as of yet.

So, it seems no need to disable HT, since it won't help. Besides, intel just came all out with rehashes with Hyper-threading.

Their 10nm cannot come soon enuf.

Defoler 03-12-2020 01:49 AM

Quote:

Originally Posted by Schmuckley (Post 28361240)
They do need one to let the javascript run though. The only propaganda being spread is by those alleged "researchers".

Most people run their browser without javascript protection. Less than 2% of people have javascript disabled or run an addon that prevent it.

So this research, as much as you fan hate love to hate because they "attack" your favorate manufacturer, and considering you have zero credentials, this is a very viable attack.

But hey, a random guy on OCN discredited those "researches" because he is angry, so we will take his word for it over BSc degree researches who have experience and actually work in research.

Liranan 03-12-2020 05:02 AM

Quote:

Originally Posted by rdr09 (Post 28364328)
The greatest performance hit to fully mitigate from the likes of Zombieload is disabling Hyper-threading. However, Cacheout that affects intel cpus, discovered earlier this year similar to this vulnerability bypasses other mitigations and does not have a permanent fix as of yet.

So, it seems no need to disable HT, since it won't help. Besides, intel just came all out with rehashes with Hyper-threading.

Their 10nm cannot come soon enuf.

Intel's 10nm is terrible and worse than their 14nm++++++++++++++++++++++++++++++++++++++++++++++ +++ and it certainly doesn't contain any mitigations for this attack. Intel need an entirely new architecture and I bet they're working hard on something akin to AMD's chiplet.

WannaBeOCer 03-12-2020 07:38 AM

Quote:

Originally Posted by Liranan (Post 28364498)
Intel's 10nm is terrible and worse than their 14nm++++++++++++++++++++++++++++++++++++++++++++++ +++ and it certainly doesn't contain any mitigations for this attack. Intel need an entirely new architecture and I bet they're working hard on something akin to AMD's chiplet.

Do some research before posting. Ice Lake is 18% faster than Skylake and has hardware mitigations for CacheOut and Zombieload along with the latest LVI injection. The only downside to Ice lake is the core clock.

https://software.intel.com/security-...alue-injection

ku4eto 03-12-2020 07:41 AM

Quote:

Originally Posted by WannaBeOCer (Post 28364638)
Do some research before posting. Ice Lake is 18% faster than Skylake and has hardware mitigations for CacheOut and Zombieload along with the latest LVI injection. The only downside to Ice lake is the core clock.

https://software.intel.com/security-...alue-injection

And the wield on 10nm are what causes those low clocks (and low core count). IPC gains are there, but with 3Ghz dual cores, i do not think they are going to matter much.

bigjdubb 03-12-2020 07:59 AM

Quote:

Originally Posted by WannaBeOCer (Post 28364638)
Do some research before posting. Ice Lake is 18% faster than Skylake and has hardware mitigations for CacheOut and Zombieload along with the latest LVI injection. The only downside to Ice lake is the core clock.

https://software.intel.com/security-...alue-injection

It sounded almost like you were describing any one of my AMD processors. Mostly secure, good IPC improvements, the only downside is core clock.

WannaBeOCer 03-12-2020 08:04 AM

Quote:

Originally Posted by ku4eto (Post 28364642)
And the wield on 10nm are what causes those low clocks (and low core count). IPC gains are there, but with 3Ghz dual cores, i do not think they are going to matter much.

Pretty sure the upcoming Ice Lake based Xeon's are 2Ghz+ up to 38 cores.

rdr09 03-12-2020 08:12 AM

Quote:

Originally Posted by ku4eto (Post 28364642)
And the wield on 10nm are what causes those low clocks (and low core count). IPC gains are there, but with 3Ghz dual cores, i do not think they are going to matter much.

Me thinks the vulnerability that will beset intel's 10 nm is Corona.

They prolly take it home and work on it.:)

Liranan 03-12-2020 10:25 AM

Quote:

Originally Posted by WannaBeOCer (Post 28364638)
Do some research before posting. Ice Lake is 18% faster than Skylake and has hardware mitigations for CacheOut and Zombieload along with the latest LVI injection. The only downside to Ice lake is the core clock.

https://software.intel.com/security-...alue-injection

The problem with Netburst and Bulldozer was also clock speed, so, why don't you do some research into these throttling chips? Intel's 10nm is so bad it barely matches the previous gen and all we've had so far are mobile chips because yields are terrible and performance is awful.


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