bf927b44c8
Change-Id: If45a7fd3d6d3a7a52e71595de32ea4cf04e23d36 Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
47 lines
1.5 KiB
Plaintext
47 lines
1.5 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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./scripts/build_kmod.sh build && 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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Total Channel Performance Data 5655 MB/s
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3. Cleanup
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./scripts/build_kmod.sh clean
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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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