Ok, I understand now where the CMA default sizes come from but I don't
understand the rational behind them.
Default size specified in cma-overlay.dts:
/*
* The default size when using this overlay is 256 MB
* and should be kept as is for backwards
* compatibility.
*/
size = <0x10000000>;
There are three vc4-kms-v3d overlays, one for Pi 5, one for Pi 4 and one for
the rest. They all include cma-overlay.dts. But:
Pi 3: The size is *not* overridden, hence we get 256MB.
Pi 4: The size is overridden with 'size = <((512-4)*1024*1024)>;' -> 508MB.
Pi 5: The size is overridden with 'size = <(64*1024*1024)>;' -> 64MB.
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https://bugs.launchpad.net/bugs/2060300
Title:
KMS overlay causes OOM oops on 3A+
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