New Windows 11 Patch Worsens Ryzen L3 Cache Latency, AMD Announces Fix Dates

by Hilbert Hagedoorn on: 10/13/2021 09:06 AM | source: reddit | 55 comment(s)

Microsoft released the first Cumulative Updates for Windows 11 on October 12th. AMD and Microsoft discovered shortly after the release of Windows 11 that the OS is not optimized for AMD Ryzen CPUs, resulting in higher L3 cache latency and a broken UEFI-CPPC2 (preferred cores mechanism).

Testing revelas a close to 20 ns L3 cache delay for some Ryzen processors. The October 12 "patch Tuesday" update increased that value even worse reaching 30 ns.

AMD made a remark on social media that was shared on Reddit. The company stated that fixes for the two bugs are being developed and will be available soon. On October 21, the UEFI-CPPC2 bug patch will be released. AMD's "customers" include huge organizations who use Threadripper or EPYC workstations to conduct mission-critical workloads. On October 19, Windows Update will fix the L3 cache delay bug.

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blacknova
Junior Member

Posts: 18
Joined: 2016-11-30

#5954911 Posted on: 10/13/2021 10:30 AM

I don't get something, why news title state "worsen" if news text say the problem have been resolved?

haste
Senior Member

Posts: 1475
Joined: 2006-09-30

#5954914 Posted on: 10/13/2021 10:36 AM

I don't get something, why news title state "worsen" if news text say the problem have been resolved?

Because W11 cumulative patch which has been released yesterday made the problem even worse. Those fixes for latency issues did not make it to this cumulative update and will be added to later cumulative updates. Is it clear now?

blacknova
Junior Member

Posts: 18
Joined: 2016-11-30

#5954916 Posted on: 10/13/2021 10:40 AM

Thanks.

Alessio1989
Senior Member

Posts: 2116
Joined: 2015-06-11

#5954919 Posted on: 10/13/2021 10:50 AM

yeah agile programming produces quality!

mackintosh
Senior Member

Posts: 548
Joined: 2012-11-28

#5954924 Posted on: 10/13/2021 11:08 AM

I have to say I'm surprised this is taking so long.

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