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AMD said their drivers/software should handle it. Basically working with Microsoft to get the Windows scheduler make the correct decision. No clue how it would

by doikor 4y ago

AMD said their drivers/software should handle it. Basically working with Microsoft to get the Windows scheduler make the correct decision. No clue how it would work with Linux though. Intel did similar work with E/P cores.

csdvrx 4y ago
> Intel did similar work with E/P cores. Indeed, that's Lakefield as seen in the Intel Core i5-L16G7. The Scheduler changes (in Windows 11 at least) make it extremely pleasant to use on the Lenovo X1 Fold, even if there're some drivers problems (fortunately easy to fix: https://csdvrx.github.io/ https://csdvrx.github.io/ )
- smolder 4y ago
  > (in Windows 11 at least) That seems to answer my (sibling to yours) comments question. Perhaps the 7800x3d is the only sku unbothered by older OSs, then.
  - _rs 4y ago
    I was thinking of buying a 5800X3D for my gaming rig (as it is already AM4). Am I reading correctly that I might need to upgrade to Windows 11 to get the full benefits of it?
    - philliphaydon 4y ago
      5800x3d should work fine on everything. The 7800x3d should also work fine. It’s the 7900/7950 that may not run well cos of the 3d stacking only on 1 ccd. So one has it and one doesn’t and that may cause issues.
    - smolder 4y ago
      No, only the 7950x3d and 7900x3d from AMD have this property of asymmetrical cores. This is a new thing for AMD. For the 5800x3d, or the 7800x3d, it's only 1 CCD so there's no asymmetry, and no scheduler accomodations are needed. Likewise, any non-x3d chips are symmetrical.
smolder 4y ago
Any idea if this is a win 11 thing? I've got a 7700x currently in part because I didn't want to run win 11 in order to support the big.little arch of Intel's latest. When the 12900k and friends came out I recall reading that just win 11 was getting the scheduling updates to support it well.
- philliphaydon 4y ago
  Even now I don’t think it’s supported well. I still get weird issues with a 12700 but non big.little works more consistently.

by doikor 4y ago

csdvrx 4y ago

> Intel did similar work with E/P cores. Indeed, that's Lakefield as seen in the Intel Core i5-L16G7. The Scheduler changes (in Windows 11 at least) make it extremely pleasant to use on the Lenovo X1 Fold, even if there're some drivers problems (fortunately easy to fix: https://csdvrx.github.io/ https://csdvrx.github.io/ )

smolder 4y ago
> (in Windows 11 at least) That seems to answer my (sibling to yours) comments question. Perhaps the 7800x3d is the only sku unbothered by older OSs, then.
- _rs 4y ago
  I was thinking of buying a 5800X3D for my gaming rig (as it is already AM4). Am I reading correctly that I might need to upgrade to Windows 11 to get the full benefits of it?
  - philliphaydon 4y ago
    5800x3d should work fine on everything. The 7800x3d should also work fine. It’s the 7900/7950 that may not run well cos of the 3d stacking only on 1 ccd. So one has it and one doesn’t and that may cause issues.
  - smolder 4y ago
    No, only the 7950x3d and 7900x3d from AMD have this property of asymmetrical cores. This is a new thing for AMD. For the 5800x3d, or the 7800x3d, it's only 1 CCD so there's no asymmetry, and no scheduler accomodations are needed. Likewise, any non-x3d chips are symmetrical.

smolder 4y ago

Any idea if this is a win 11 thing? I've got a 7700x currently in part because I didn't want to run win 11 in order to support the big.little arch of Intel's latest. When the 12900k and friends came out I recall reading that just win 11 was getting the scheduling updates to support it well.

philliphaydon 4y ago
Even now I don’t think it’s supported well. I still get weird issues with a 12700 but non big.little works more consistently.