linux-kernel - [PATCH 0/2] dmaengine: ti: k3-udma: memcpy throughput improvement

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Message-ID: <20201214081310.10746-1-peter.ujfalusi@ti.com>
Date:   Mon, 14 Dec 2020 10:13:08 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>
CC:     <dan.j.williams@...el.com>, <linux-kernel@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <vigneshr@...com>,
        <grygorii.strashko@...com>, <kishon@...com>
Subject: [PATCH 0/2] dmaengine: ti: k3-udma: memcpy throughput improvement

Hi,

Newer members of the KS3 family (after AM654) have support for burst_size
configuration for each DMA channel.

The HW default value is 64 bytes but on higher throughput channels it can be
increased to 256 bytes (UCHANs) or 128 byes (HCHANs).

Aligning the buffers and length of the transfer to the burst size also increases
the throughput.

Numbers gathered on j721e (UCHAN pair):
echo 8000000 > /sys/module/dmatest/parameters/test_buf_size
echo 2000 > /sys/module/dmatest/parameters/timeout
echo 50 > /sys/module/dmatest/parameters/iterations
echo 1 > /sys/module/dmatest/parameters/max_channels

Prior to  this patch:   ~1.3 GB/s
After this patch:       ~1.8 GB/s
 with 1 byte alignment: ~1.7 GB/s

The patches are on top of the AM64 support series:
https://lore.kernel.org/lkml/20201208090440.31792-1-peter.ujfalusi@ti.com/

Regards,
Peter
---
Peter Ujfalusi (2):
  dmaengine: Extend the dmaengine_alignment for 128 and 256 bytes
  dmaengine: ti: k3-udma: Add support for burst_size configuration for
    mem2mem

 drivers/dma/ti/k3-udma.c  | 115 ++++++++++++++++++++++++++++++++++++--
 include/linux/dmaengine.h |   2 +
 2 files changed, 112 insertions(+), 5 deletions(-)

-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki