Wednesday, October 6th 2021
AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled
Apparently, AMD processors officially compatible with Windows 11, exhibit a three-times increase in L3 cache latency with the new operating system. The new operating system is also found to break the "preferred cores" system on AMD processors (UEFI CPPC2), in which the two "best" CPU cores, which can sustain the highest boost frequencies, are highlighted to the operating system, so most of the light-threaded traffic could be sent to them.
AMD and Microsoft jointly made this discovery, and listed out potential impact on application performance. The increased L3 cache latency affects performance of applications sensitive to memory performance. They also warn of a 10-15% loss in gaming performance. On the other hand, a dysfunctional "preferred cores" system would mean reduced performance in light-threaded tasks as the OS is unaware which are the processor's two best cores. Thankfully, both issues can be fixed via software updates, and AMD is working with Microsoft to push fixes for both issues through Windows Update, in an update rollout scheduled within October 2021.
Source:
AMD
AMD and Microsoft jointly made this discovery, and listed out potential impact on application performance. The increased L3 cache latency affects performance of applications sensitive to memory performance. They also warn of a 10-15% loss in gaming performance. On the other hand, a dysfunctional "preferred cores" system would mean reduced performance in light-threaded tasks as the OS is unaware which are the processor's two best cores. Thankfully, both issues can be fixed via software updates, and AMD is working with Microsoft to push fixes for both issues through Windows Update, in an update rollout scheduled within October 2021.
141 Comments on AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled
Likely to do with VMR (acronym might be VmS or something, no VBS read the thread) ie fully virtualized OS security.
There were reports it'll affect ALL CPUs as much as 25%.
Feels like Intel's pr mill utilised that info to nudge sales IMHO.
Ie bullshit news piece IMHO without context, testing and competitive comparison.
@btarunr you even linked OEM window 11 build advice?!.
Apparently your sources are shit and secret.
If you're running an unsupported processor, well, I don't know, but expect it to be worse.
I'm keeping my strict policy of maximum delay on Windows updates. Should be all fine then...
Oh and I said VBS or corrected what I meant.
m.hexus.net/tech/news/software/148462-pc-users-need-wary-vbs-performance-impacts-win-11/
This makes VBS seem like the OS system level component of HVci
I'll await benches before I get critical, I'm not going 11 yet anyway.
Its fomo is invalid, what would even be the advantage of the 'upgrade'?
The newer interface and the bloatware does not justify it in my mind.
www.tomshardware.com/news/windows-11-security-gaming-application-performance-benchmarks
Tom's Hardware's tested VBS on and off on Intel's 10700K and 11700K and AMD's 3800X and 5800X. Mind you, this are merely tests on VBS impact alone, it's got nothing on whatever is going on with the L3 cache issue.
The 15% impact is an AMD's estimated measure on select games
That's what they said upto 7-8% with testing.
Plus AMD state 15% is possible while Intel stayed shtum and that all equals this, right I'll leave you to it I was mistaken, it's far less significant then I thought, at least ATM ,you can stay on 10, shrug.
@btarunr I feel the story could have been written better but ah well.
And I don't know about Zen+ either, which doesn't have MBEC...
Reality is MS loves AMD (Xbox is amd based), and is familiar with AMD architectures... doubtful this will be around for very long.