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?

 

[Accord99]

Toms tested the patches in games. Their tests are strange so there might be some bad testing methodology. Some games, like SOTR is actually faster in Win 11 with no patches. Some games are faster in 11 w/patches than 10.

I was looking for video reviews of the patch and this one also shows a small difference for most games.

 

[Asterox]

New problem, this should definitely be taken into account during testing.

https://twitter.com/x/status/1454778534929461249

 

[deasd]

New problem, this should definitely be taken into account during testing.

https://twitter.com/x/status/1454778534929461249

Well... at least there's good news, under Win11 with best scenario AMD also have some improvement(5%) in game. But the prerequisites are with best scenario which include PATCHes and install the AMD cpus CORRECTLY...

Now I can foresee the Chaos from bunch of CPU reviews which are about to be released soon.

 

[Joe NYC]

Next, we will find out that starts also have to be aligned in order for Windows 11 to work:

https://twitter.com/x/status/1454778612314345474

 

[jpiniero]

Seems like reviewers should just dump Ryzen for now.

 

[Markfw]

Seems like reviewers should just dump Ryzen for now.

And how in the world can you know the performance against the competition ? To dump Ryzen in reviews would be insane.

 

[jpiniero]

And how in the world can you know the performance against the competition ? To dump Ryzen in reviews would be insane.

The alternative is people complaining about being unfair since it's unlikely AMD/MS will push any more patches in time for reviewers to test again.

 

[Markfw]

The alternative is people complaining about being unfair since it's unlikely AMD/MS will push any more patches in time for reviewers to test again.

Well, it is unfair, and it has been since this started. MS designed a product to slow down AMD while helping Intel ? Or at least didn;t bother to take them into account when designing the software ? Either way its THEIR product that is at fault, not AMD. You could even use linux the test the hardware on both.

 

[jpiniero]

Either way its THEIR product that is at fault, not AMD.

It is at least in some level since they are at least partially responsible for doing QA to check for these kind of regressions. It's not like MS hid Windows 11 betas from AMD or even the public.

 

[Zucker2k]

Seems like reviewers should just dump Ryzen for now.

Okay, AMD no longer has a functional platform on both Windows 10 and Windows 11 because ADL benchmarks incoming. Right? LOL! It's really amusing watching the frenzy and desperation of those who expect old hardware to run flawlessly on a new Windows platform. That never happens. Somethings are going to run better on Windows 10, and some are going to run better on Windows 11. It'll take many updates to whip the new OS into shape. But I suppose we're in different times now, any benchmark that runs less on Windows 11 is automatically due to sabotage (See @Markfw post above). This is typical of AMDers; every time Intel launches a product, they start splitting hairs. Who else remembers the 95w locked i9 9900k tests versus Ryzen Refresh? This after initial reviews had been published? How about spectre mitigations, etc.? Yet, with all that drama a 2700x still has nothing on a 9900k? This attitude is really getting pathetic and needs to stop.

Edit: @VirtualLarry I see you. Did I touch a nerve?

 

[scannall]

A solution for reviewers I think would be to continue to use Windows 10 for Ryzen until Windows 11 has been sorted out. Since there is really no performance difference between 10 and 11 on Intel CPU's at this time. Levels the playing field putting everyone on equal footing.

 

[Zucker2k]

Well, it is unfair, and it has been since this started. MS designed a product to slow down AMD while helping Intel ? Or at least didn;t bother to take them into account when designing the software ? Either way its THEIR product that is at fault, not AMD. You could even use linux the test the hardware on both.

With talk like this why are you then looking forward to reviews in order to make a judgement like you've been saying in all these threads? You clearly have an-inbuilt excuse in-waiting. Yet, you insist the reviews must be inclusive, which I agree with, by the way, but obviously for different reasons.

 

[mikk]

I was looking for video reviews of the patch and this one also shows a small difference for most games.

Good explanation for why there is such a big difference in AIDA64 and not so much in real world:

https://twitter.com/x/status/1454662478672142338

 

[igor_kavinski]

You could even use linux the test the hardware on both.

Does Linux play well with Intel Thread Director? Then people may cry that poor Intel Alder Lake is being forced to swim against an unoptimized scheduler. Maybe WSL2 on Windows 11 is the answer?

 

[Markfw]

Does Linux play well with Intel Thread Director? Then people may cry that poor Intel Alder Lake is being forced to swim against an unoptimized scheduler. Maybe WSL2 on Windows 11 is the answer?

I really don't know the answer, but something should be done to try and make a fair comparison. We may see on Thursday, and maybe it doesn't matter.

 

[Panino Manino]

Next, we will find out that starts also have to be aligned in order for Windows 11 to work:

https://twitter.com/x/status/1454778612314345474

I would not be surprised if using the old "GenuineIntel" trick works to solve this "bug".

 

[igor_kavinski]

Next, we will find out that starts also have to be aligned in order for Windows 11 to work:

https://twitter.com/x/status/1454778612314345474

sfc /scannow might help.

 

[Zucker2k]

sfc /scannow might help.

Or,
dism /apply-image /imagefile:c:\install.wim /index:1 /applydir:d:\
Followed by,
bcdboot d:\windows

Should take all of 20 minutes if reviewers have multiple images, with drivers for individual chipsets and components integrated.

 

[moinmoin]

Seems like reviewers should just dump Ryzen Windows 11 for now.

Fixed it for you.

Does Linux play well with Intel Thread Director? Then people may cry that poor Intel Alder Lake is being forced to swim against an unoptimized scheduler. Maybe WSL2 on Windows 11 is the answer?

Intel Thread Director is Windows software. Intel hasn't bothered yet to introduce any Alderlake specific scheduler optimizations to Linux yet. No idea how WSL2 handles that, whether for processes in WSL2 the Windows scheduler or the Linux scheduler takes precedence.

 

[Markfw]

Fixed it for you.


Intel Thread Director is Windows software. Intel hasn't bothered yet to introduce any Alderlake specific scheduler optimizations to Linux yet. No idea how WSL2 handles that, whether for processes in WSL2 the Windows scheduler or the Linux scheduler takes precedence.

Not that I know all the specifics, but I have installed linux mint on 15 boxes, 7 of them EPYC, and no drivers were installed aside from the OS, so it is doubtful that AMD or Intel wrote drivers for themselves. Linux is all open source.

 

[moinmoin]

Not that I know all the specifics, but I have installed linux mint on 15 boxes, 7 of them EPYC, and no drivers were installed aside from the OS, so it is doubtful that AMD or Intel wrote drivers for themselves. Linux is all open source.

Under Linux schedulers are not specific to any hardware but user selectable depending on the preference how the system should handle workloads. If some hardware doesn't work as expected with them the schedulers get fixed accordingly. There's no concept of "drivers" for schedulers under Linux. (I'm also a Linux user.)

 

[igor_kavinski]

Under Linux schedulers are not specific to any hardware but user selectable depending on the preference how the system should handle workloads. If some hardware doesn't work as expected with them the schedulers get fixed accordingly. There's no concept of "drivers" for schedulers under Linux. (I'm also a Linux user.)

Ah. So Intel might be counting on the possibility that some kernel developer will get annoyed enough to write their own scheduler routine for Alder Lake.

 

[Kedas]

So how much would Alder Lake lose in performance if compared on Win10 instead of Win11?

Starts to look like we have a different OS for each CPU brand....
Game scores Win 10 AMD vs Win 11 Intel
Seems like right and wrong at the same time.

 

[igor_kavinski]

So how much would Alder Lake lose in performance if compared on Win10 instead of Win11?

Starts to look like we have a different OS for each CPU brand....
Game scores Win 10 AMD vs Win 11 Intel
Seems like right and wrong at the same time.

Considering the performance difference in most games for AMD will be less than two digit percentage points, most AMD users will just swallow their pride and keep on using Windows 11. Even those that are adamantly staying on Windows 10, will begrudgingly have a change of heart sooner or later.

 

[Kedas]

Considering the performance difference in most games for AMD will be less than two digit percentage points, most AMD users will just swallow their pride and keep on using Windows 11. Even those that are adamantly staying on Windows 10, will begrudgingly have a change of heart sooner or later.

Not so sure, people went to Win 10 because it gave a performance boost.
I know that is the reason why I didn't stay on Win 7.
I don't see any incentive to upgrade to Win 11 now for me, it's even the opposide I would feel stupid if I do.