UM0851 datasheet(172/245 Pages) STMICROELECTRONICS

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Accelerator engine device drivers

UM0851

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Doc ID 16604 Rev 2

6.2.3

DMA device driver performance

The driver performance was evaluated using the following setup:

●

Target device: SPEAr600

–

CPU: 332 MHz - AHB: 166 MHz - DDR: 333 MHz

●

Test method: Use of DMA memory to memory (DDR to DDR) transfers with a single

master for both source and destination transfers.

To test the driver performance:

Select CONFIG_DMATEST as Module under device drivers/DMA Engine support/ in

menuconfig

Compile modules with make modules

After linux boot up, “insmod dmatest.ko” will start dma memcpy transfers on multiple

threads

Doing “rmmod dmatest.ko” stops all dma mempy transfers and shows its result as pass

or fail

Note:

The dmatest.ko is a standard module that does not provide any performance evaluation

features, but only testing capabilites. The module has been slightly modified in order to

provide performance results.

Table 44.

DMA device performance results

Burst Size

Data Copied

(MBytes)

Time Taken

(uS)

DMA Throughput

(MB/s)

938511

17.88

205907

81.48

125076

134.14

89077

188.35

89118

188.26

89075

188.35

128

89077

188.35

256

89080

188.34

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