Re: [PATCH] Revert "drm/ttm: increase ttm pre-fault value to PMD size"

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On Tue, Aug 20, 2024 at 9:46 AM Alex Deucher <alexander.deucher@xxxxxxx> wrote:
>
> This reverts commit 0ddd2ae586d28e521d37393364d989ce118802e0.
>
> This patch causes sluggishness and stuttering in graphical
> apps.
>
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3564
> Link: https://www.spinics.net/lists/dri-devel/msg457005.html
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Zhu Lingshan <lingshan.zhu@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> ---
>  include/drm/ttm/ttm_bo.h | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h
> index ef0f52f56ebc..6ccf96c91f3a 100644
> --- a/include/drm/ttm/ttm_bo.h
> +++ b/include/drm/ttm/ttm_bo.h
> @@ -39,11 +39,7 @@
>  #include "ttm_device.h"
>
>  /* Default number of pre-faulted pages in the TTM fault handler */
> -#if CONFIG_PGTABLE_LEVELS > 2
> -#define TTM_BO_VM_NUM_PREFAULT (1 << (PMD_SHIFT - PAGE_SHIFT))
> -#else
>  #define TTM_BO_VM_NUM_PREFAULT 16
> -#endif
>
>  struct iosys_map;
>
> --
> 2.46.0
>




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