On 4/2/2020 2:27 AM, leonid.ravich@xxxxxxxx wrote:
From: Leonid Ravich <Leonid.Ravich@xxxxxxx>
current IOAT driver using big (2MB) allocations chunk for its descriptors
therefore each ioat dma engine need 2 such chunks
(64k entres in ring each entry 64B = 4MB)
requiring 2 * 2M * dmaengine contiguies memory chunk
might fail due to memory fragmention.
so we decresging chunk size and using more chunks.
decreasing
Signed-off-by: Leonid Ravich <Leonid.Ravich@xxxxxxx>
Acked-by: Dave Jiang <dave.jiang@xxxxxxxxx> if the two patches have been
tested on hw.
---
drivers/dma/ioat/dma.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 535aba9..e9757bc 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -83,7 +83,7 @@ struct ioatdma_device {
#define IOAT_MAX_ORDER 16
#define IOAT_MAX_DESCS (1 << IOAT_MAX_ORDER)
-#define IOAT_CHUNK_SIZE (SZ_2M)
+#define IOAT_CHUNK_SIZE (SZ_512K)
#define IOAT_DESCS_PER_CHUNK (IOAT_CHUNK_SIZE/IOAT_DESC_SZ)
struct ioat_descs {
