See
https://lore.kernel.org/dri-devel/[email protected]/
;)
On 03.08.26 16:41, Xaver Hugl wrote:
Buffer sizes can get big very fast, and the previous limit of 64MB
is easily hit nowadays.
I hit this problem while working on better multi-gpu copies for KWin,
where on my 5120x1440 monitor with scaling applied, some apps ended
up using a resolution of 8192x2304, resulting in buffer sizes of
roughly 75MB.
As another reference, with merely 32 bits per pixel, buffers reach
- 33MB for 4k
- 133MB for 8k
- 530MB for 16k
With 64bpp, those sizes would be doubled, and even 4k would hit the
previous 64MB limit.
Signed-off-by: Xaver Hugl <[email protected]>
Cc: [email protected]
---
drivers/dma-buf/udmabuf.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 2f94be1df525..8cbba7ddfa00 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -20,9 +20,9 @@ static int list_limit = 1024;
module_param(list_limit, int, 0644);
MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. Default is
1024.");
-static int size_limit_mb = 64;
+static int size_limit_mb = 1024;
module_param(size_limit_mb, int, 0644);
-MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is
64.");
+MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is
1024.");
struct udmabuf {
pgoff_t pagecount;
--
Robert Mader
Consultant Software Developer
Collabora Ltd.
Platinum Building, St John's Innovation Park, Cambridge CB4 0DS, UK
Registered in England & Wales, no. 5513718
