Info AMD confirms Windows 11 slow down its CPUs up to 15%

[deasd]

AMD processors hit by performance issues on Windows 11, patch on the way

AMD has said that its CPUs are taking a performance hit on Windows 11 systems and that it has teams working on the issues. Patches should be released later this month through Windows.

www.neowin.net

AMD: Windows 11 Slows Our CPUs Up To 15%, Patch Coming

High latency bug hits fast

www.tomshardware.com

AMD: Windows 11 May Cause Performance Dips Of Up To 15% On Ryzen CPUs

AMD reported issues that their Windows 11 compatible AMD Ryze CPUs were having with performance while running certain applications.

wccftech.com

The issue mentioned in the opening paragraph is caused by functional L3 cache latency which has increased by around three times on affected hardware. The programs that will suffer include those sensitive to memory subsystem access times. AMD noted another problem too, explaining that UEFI CPPC2 may not schedule threads on the processor’s fastest core preferentially.


Regarding the latter issue, applications sensitive to the performance of one or a few CPU threads will see a performance hit. The issue will be more noticeable on greater than 8-core processors that operate at over 65W. This issue should also be fixed this month.

hmmmm, whose fault is it this time? It screw up the future hardware review if true? what about Intel side?

 

[igor_kavinski]

All AMD need is to reasonably prove MS's intention and they've got themselves a payday. Even more if the proof showed that Intel put MS up to it.

They wouldn't dare antagonize the one company that allows their chips to do something useful for the majority of people out there. Who are they gonna turn to? Valve and their SteamOS? But they CAN sue Intel if it had anything to do with this fiasco.

 

[uzzi38]

Yeah, making an enemy out of MS is bad choice.

 

[jpiniero]

Yeah, making an enemy out of MS is bad choice.

It's still not clear if this is even MS's fault in any way.

 

[Hans de Vries]

They wouldn't dare antagonize the one company that allows their chips to do something useful for the majority of people out there. Who are they gonna turn to? Valve and their SteamOS? But they CAN sue Intel if it had anything to do with this fiasco.

AMD can never sue Microsoft obviously...
but a law company can start a Class Action in the name of AMD clients and AMD shareholders in the case of sabotaging AMD's revolutionary V 3D cache concept.

 

[mikeymikec]

@igor_kavinski @uzzi38 @jpiniero @Hans de Vries you know, in the scenario that MS did this on purpose, how could AMD consider them anything other than an enemy? The alternative is letting them continue to sabotage their products.

 

[igor_kavinski]

you know, in the scenario that MS did this on purpose, how could AMD consider them anything other than an enemy?

They better start working on their own OS, preferably open source. Intel has Clear Linux. AMD could take that notion one step further and optimize it for gaming with Valve's help, designing their own open gaming standards as a direct and easier to develop for alternative to DirectX.

 

[naukkis]

Anyone has explanation of that L3-performance degradation? Obviously L3-access miss TLB and pagewalks are needed but why? Does W11 disable parts of AMD's TLB cache?

 

[jpiniero]

Anyone has explanation of that L3-performance degradation? Obviously L3-access miss TLB and pagewalks are needed but why? Does W11 disable parts of AMD's TLB cache?

Just speculation at this point. If this is because of a security issue I doubt either MS or AMD will admit that until a Windows 10 patch is released.

 

[Bigos]

Looking at toms hardware latency data, it looks like the L3 capacity is smaller under W11. The latency is still at normal levels below 1-2 MB of space. Either the L3 cache is partitioned differently (some of the space is reserved for other privilege levels) or something is using this space. Maybe the L3 cache hash method is not taking into account some hardware features used by W11?

 

[Hitman928]

Looking at toms hardware latency data, it looks like the L3 capacity is smaller under W11. The latency is still at normal levels below 1-2 MB of space. Either the L3 cache is partitioned differently (some of the space is reserved for other privilege levels) or something is using this space. Maybe the L3 cache hash method is not taking into account some hardware features used by W11?

L2 cache is 3 MB per CCD so the L3 cache weirdness doesn't start until around that mark.

 

[DisEnchantment]

Releasing Windows 11 Build 22000.282 to Beta and Release Preview Channels

Hello Windows Insiders, today we’re releasing Windows 11 Build 22000.282 to Windows Insiders in the Beta and Release Preview Channels. This update includes the following improvements: We fixed an L3 caching issue that might affect perfo

blogs.windows.com

We fixed an L3 caching issue that might affect performance in some applications on devices that have AMD Ryzen processors after upgrading to Windows 11 (original release).

MS made the fix, the update from AMD will arrive.

 

[Joe NYC]

Releasing Windows 11 Build 22000.282 to Beta and Release Preview Channels

Hello Windows Insiders, today we’re releasing Windows 11 Build 22000.282 to Windows Insiders in the Beta and Release Preview Channels. This update includes the following improvements: We fixed an L3 caching issue that might affect perfo

blogs.windows.com

MS made the fix, the update from AMD will arrive.

Still, not at all confidence inspiring that Microsoft would allow this to be shipped as official release, knowing that the major feature is broken.

 

[DrMrLordX]

The one thing that Intel has likely done is effectively forced MS to launch Win11 early to coincide with the launch of Alder Lake. AMD's fix was in dev channel, and obviously has worked its way into the beta channel. So the Oct 12th update represents a scheduled code update that was likely approved for release some time ago. It'll probably be another 1-2 weeks until the fix for the L3 cache and CPPC2 problems finally makes its way into the release OS.

 

[LikeLinus]

Still, not at all confidence inspiring that Microsoft would allow this to be shipped as official release, knowing that the major feature is broken.

Or with AMD since they didn't updated their driver and it causes performance loss issues as well. Right?

 

[Joe NYC]

Or with AMD since they didn't updated their driver and it causes performance loss issues as well. Right?

AMD driver is working just fine in Windows 10.

 

[LikeLinus]

AMD driver is working just fine in Windows 10.

Uh yeah? This isn't about Windows 10.

 

[Joe NYC]

Uh yeah? This isn't about Windows 10.

It is about Windows 10, because it is the baseline. If you can't even get to the baseline, then you don't ship.

 

[jpiniero]

It is about Windows 10, because it is the baseline. If you can't even get to the baseline, then you don't ship.

But OEMs want it to go RTM in September so they can fill the channel. Or in this case August 31st. Dell's laptops "for home" is currently 105 different models for Windows 11 versus 37 for WIndows 10.

 

[Joe NYC]

But OEMs want it to go RTM in September so they can fill the channel. Or in this case August 31st. Dell's laptops "for home" is currently 105 different models for Windows 11 versus 37 for WIndows 10.

That seems like a risky move. The customers who get Windows 10 have a chance to go to 11, but those who buy Windows 11 are stuck.

 

[TheELF]

They wouldn't dare antagonize the one company that allows their chips to do something useful for the majority of people out there. Who are they gonna turn to? Valve and their SteamOS? But they CAN sue Intel if it had anything to do with this fiasco.

Why not?! What are they going to do? Delay important fixes?
If MS would cut off AMD from windows they would be sued into oblivion, this is something that never ever could happen.

Still, not at all confidence inspiring that Microsoft would allow this to be shipped as official release, knowing that the major feature is broken.

Have you ever heard about the internet?! I believe you are using it right now.
Official release doesn't mean anything anymore since you (and everybody that has any kind of device) are getting updates all the time.

 

[Thibsie]

Have you ever heard about the internet?! I believe you are using it right now.
Official release doesn't mean anything anymore since you (and everybody that has any kind of device) are getting updates all the time.

Of course it does.

 

[lobz]

dows W11 do anything IRL better than W10 ?

Alder Lake.

 

[jpiniero]

That seems like a risky move. The customers who get Windows 10 have a chance to go to 11, but those who buy Windows 11 are stuck.

Windows 11 is really nothing more than a feature release of Windows 10. Consumers are going to be forced upgraded eventually anyway.

 

[DigDog]

Windows 11 is really nothing more than a feature release of Windows 10. SOME Consumers are going to be forced upgraded eventually anyway.

.. and some won't.

 

[igor_kavinski]

Consumers are going to be forced upgraded eventually anyway.

Except the millions with unsupported hardware. It will be a miracle if Windows 11 achieves an installed base of 50% worldwide among Windows machines by 2025, which is when Windows 10 is supposed to sunset. Microsoft will either have to relax the hardware requirements or prolong Windows 10's life. Fun headache when your old product refuses to die