Computer Software > Windows 11

Bug in Windows 11 installation

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Weaver:
It might be faster because it could dare to rely on the availability of important new instructions, and can remove performance-killing conditional branches that check for supported-vs-unsupported features.

Alex Atkin UK:

--- Quote from: Weaver on October 19, 2021, 04:35:42 PM ---It might be faster because it could dare to rely on the availability of important new instructions, and can remove performance-killing conditional branches that check for supported-vs-unsupported features.

--- End quote ---

That's been my theory for their future plans, but not seen any evidence they've done it yet.  In fact as I have an AMD CPU it will have actually been running slower due to their sheduler and L3 cache bugs, lol.

Weaver:
Have they made bad changes to their scheduler ? Could you clarify about L3 caching?

Updates in recent years have as we know been horrible because of a new phenomenon: security updates (for very unlikely issues) that absolutely crucify performance, to do with CPUs leaking information to other threads/processes etc. I doubt there are any such new fixes in Win 11 RC that are not also in recent Win 10 panicky security updates, since those fixes normally get applied quickly to every o/s version.

Alex Atkin UK:

--- Quote from: Weaver on October 20, 2021, 02:56:20 AM ---Have they made bad changes to their scheduler ? Could you clarify about L3 caching?

--- End quote ---

https://arstechnica.com/gadgets/2021/10/fixes-for-amd-ryzen-performance-other-windows-11-issues-rolling-out-to-testers-now/


--- Quote ---The headliner here is a fix for a problem affecting L3 cache latency on AMD Ryzen processors. According to AMD, the bug can reduce performance by 3Ė5 percent. The Windows 11 update released earlier this week may have actually made the problem worse, but at least a fix is imminent.

The L3 latency bug is one of a pair of problems that AMD identified with Windows 11 earlier this month. The other Windows 11 problem AMD identified, which can prevent high-core-count, high-wattage Ryzen chips from correctly assigning work to the processor's fastest individual cores, will be fixed via an AMD driver update.
--- End quote ---

Of course I think people are blowing these problems way out of proportion, especially considering how quickly they are being fixed.

Not surprised I didn't notice them though, I have a top-end Ryzen 9 so it has tons of overhead for my usage, which was why I bought it.

Weaver:
I believe some of the Ryzen processors can execute max 5 ops in parallel under the right conditions, compared with Intelís four. Thatís something that I think is amazing about the good Ryzen CPUs. I donít know if thatís true for the lower end ĎRyzení-branded CPUs in their range?

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