0e6463d9b3
For the purpose to make performance comparison between the ioat kernel driver and user space driver, we added the kernel driver test harness here, all the workload executed in the kernel space and controlled via sysfs. Change-Id: I2c8d826283405a5e1c9ba6a033503bcb98541370 Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
IOAT Kernel Driver Test Tool
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============================
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For the purpose to make performance comparison with user space IOAT
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driver, we developed the test tool based on IOAT kernel driver, the
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test tool contains 2 components: kernel test module and user space
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application. The kernel test module allocated one kernel thread for
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each DMA channel, and the kernel thread did not pin to specified
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CPU cores, but ensure all the thread run in the same NUMA socket
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with DMA channel, and the user space application communicated
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with kernel test module via sysfs interface.
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Building & Usage
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================
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1. Compile and load the kernel test module first.
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modprobe -v ioatdma
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cd kmod && make && insmod dmaperf.ko
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2. Run the test application.
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Parameters:
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[-h usage]
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[-n number of DMA channels]
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[-q queue depth, per DMA channel]
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[-s [n^2] transfer size, per descriptor]
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[-t total [n^2] data to tranfer, per DMA channel]
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For example: ./ioat_kperf -n 4 -q 128 -s 12 -t 32
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Total 4 Channels, Queue_Depth 128, Transfer Size 4096 Bytes, Total Transfer Size 4 GB
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Running I/O . . . .
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Channel 0 Performance Data 1414 MB/s
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Channel 1 Performance Data 1413 MB/s
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Channel 2 Performance Data 1413 MB/s
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Channel 3 Performance Data 1415 MB/s
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OS Support
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==========
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We have tested several Linux distributions, currently Fedora 21/22 with kernel
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version >= 3.17 are supported.
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