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Message-Id: <20200402092725.15121-2-leonid.ravich@dell.com>
Date: Thu, 2 Apr 2020 12:27:18 +0300
From: leonid.ravich@...l.com
To: dmaengine@...r.kernel.org
Cc: lravich@...il.com, Leonid Ravich <Leonid.Ravich@...l.com>,
Vinod Koul <vkoul@...nel.org>,
Dan Williams <dan.j.williams@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexios Zavras <alexios.zavras@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
"Alexander.Barabash@...l.com" <Alexander.Barabash@...l.com>,
Thomas Gleixner <tglx@...utronix.de>,
Kate Stewart <kstewart@...uxfoundation.org>,
Jilayne Lovejoy <opensource@...ayne.com>,
Logan Gunthorpe <logang@...tatee.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] dmaengine: ioat: Decreasing allocation chunk size 2M -> 512K
From: Leonid Ravich <Leonid.Ravich@....com>
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.
Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>
---
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 {
--
1.9.3
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