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How to change from gbm(drm) backend to triple buffering?

John.Kim

How to change from gbm(drm) backend to triple buffering?

I want to change the number of buffering in the gbm(drm) backend.

However, the gbm backend seems to be fixed with double buffering.

root@~# cat /sys/kernel/debug/dma_buf/bufinfo

Dma-buf Objects:
size flags mode count exp_name ino

05529600 00000000 00000005 00000004 drm 00005855
Exclusive fence: mali mali.timeline signalled
Attached Devices:
10100000.gpu
Total 1 devices attached

05529600 00000000 00000005 00000004 drm 00007459
Exclusive fence: mali mali.timeline signalled
Attached Devices:
10100000.gpu
Total 1 devices attached

please help.

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  • 0 Arm Employee Badge

    Hi, I'm guessing this is with Mesa, and wants a Mesa solution? If so, it might be worth raising an issue on the Mesa github. If not we definitely need more information.

    (I'm assuming GBM = Generic Buffer Management; DRM = Direct Rendering Manager)

    Have you got more information / context about where you are trying to do this? OS etc?

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  • 0 Arm Employee Badge

    Hi, I'm guessing this is with Mesa, and wants a Mesa solution? If so, it might be worth raising an issue on the Mesa github. If not we definitely need more information.

    (I'm assuming GBM = Generic Buffer Management; DRM = Direct Rendering Manager)

    Have you got more information / context about where you are trying to do this? OS etc?

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