Tuesday, October 12th 2021
First Windows 11 Patch Tuesday Makes Ryzen L3 Cache Latency Worse, AMD Puts Out Fix Dates
Microsoft on October 12 put out the first Cumulative Updates for the new Windows 11 operating system, since its October 5 release. The company's monthly update packages for Windows are unofficially dubbed "patch Tuesday" updates, as they're scheduled to come out on the second Tuesday of each month. Shortly after Windows 11 launch, AMD and Microsoft jointly discovered that Windows 11 is poorly optimized for AMD Ryzen processors, which see significantly increased L3 cache latency, and the UEFI-CPPC2 (preferred cores mechanism) rendered not working. In our own testing, a Ryzen 7 2700X "Pinnacle Ridge" processor, which typically posts an L3 cache latency of 10 ns, was tested to show a latency of 17 ns. This was made much worse with the October 12 "patch Tuesday" update, driving up the latency to 31.9 ns.
AMD put out a statement on social media, which surfaced on Reddit. The company stated that patches for the two issues have been developed, and specified dates on which they'll be released. The patch for the Preferred Cores (UEFI-CPPC2) bug will be released on October 21. Customers can request the patch even earlier. By "customers," AMD is probably referring to big enterprise customers running mission-critical applications on Threadripper or EPYC-powered workstations. The L3 cache latency bug will be fixed through the Windows Update channel, its release is scheduled for October 19.
If rumors surrounding the late-October/early-November launch dates of 12th Gen Intel Core "Alder Lake" processors are true, then the situation with these patches will have a direct impact on AMD. Processor reviewers will be compelled to use Windows 11 for their Core "Alder Lake" testing, as the new operating system supposedly has greater awareness of the heterogeneous core design. The switch to Windows 11 will force a re-bench of all processors, including the AMD Ryzen chips. With AMD cautioning of an up to 15% performance hit from the added cache latency and Preferred Cores bugs, results of AMD processors in 12th Gen Core launch reviews could be affected. It is advisable for AMD to reach out to the press with these patches immediately, if they are ready.
Source:
destiny2sk (Reddit)
AMD put out a statement on social media, which surfaced on Reddit. The company stated that patches for the two issues have been developed, and specified dates on which they'll be released. The patch for the Preferred Cores (UEFI-CPPC2) bug will be released on October 21. Customers can request the patch even earlier. By "customers," AMD is probably referring to big enterprise customers running mission-critical applications on Threadripper or EPYC-powered workstations. The L3 cache latency bug will be fixed through the Windows Update channel, its release is scheduled for October 19.
157 Comments on First Windows 11 Patch Tuesday Makes Ryzen L3 Cache Latency Worse, AMD Puts Out Fix Dates
But the major responsability has to lie with Microsoft anyway since it's their product and these AMD cpu's are not exactly new.
It almost makes me wonder if any of you haven't had or seen issues about Windows 10 and then you expect things to be okay on 11?
70 ns is in Zen 2 range
All I said is that if there was foul play (which you seem convinced it was), AMD had ample opportunity to raise a flag. Which they didn't.
wow..........
I'm staying with win10
Everyone rushes to install these updates cheering they installed on old hardware
I've yet to install them yet doubt I will seeing if updates mini tool works on 11 as well as it does on 10
Matter of fact I removed 11 and 10 off my m.2 and put both on separate sata 2.5" ssd's this morning so I'm ready for shit to hit the fan lol
11 screwed the permissions up on 1 small hdd I use for a few images for 10 & 11 I couldn't even see it under computer only on disk management and free minitool would show it but showed it as logical not primary
So yeah I couldn't even create a folder or delete an old image.
This is pisspoor logic as most Ryzens are supposedly supported by MS.I'm not buying it. It's too coincidental that it's been fixed for months in the dev branch, but they can't bother to push the fix until after the Alder Lake launch.
I'm normally a critic of conspiracy theories but this one stinks... bad.
And if it's not that, it's massive incompetence that will still impact reviews for AMD on launch day of AL. It's not like incompetence with good intentions is much better if the end result is the same...
Isn't me complaining about W11, maybe i misunderstood your post?
Ah no worries, who cares mate no harm done... lol.