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

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Date:   Tue, 12 Jan 2021 09:07:03 +0530
From:   Kishon Vijay Abraham I <kishon@...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>, <peter.ujfalusi@...il.com>
Subject: Re: [PATCH 0/2] dmaengine: ti: k3-udma: memcpy throughput improvement

Hi,

On 14/12/20 1:43 pm, Peter Ujfalusi wrote:
> 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/

FWIW, tested this series with PCIe RC<->EP (using pcitest utility)
Without this series
READ => Size: 67108864 bytes      DMA: YES        Time: 0.137854270
seconds      Rate: 475400 KB/s

WRITE => Size: 67108864 bytes     DMA: YES        Time: 0.049701495
seconds      Rate: 1318592 KB/s

With this series
READ => Size: 67108864 bytes      DMA: YES        Time: 0.045611175
seconds      Rate: 1436840 KB/s

WRITE => Size: 67108864 bytes     DMA: YES        Time: 0.042737440
seconds      Rate: 1533456 KB/s

Tested-by: Kishon Vijay Abraham I <kishon@...com>

Thanks
Kishon