projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | IOAT Kernel Driver Test Tool |
| 2 | ============================ | |
| 3 | ||
| 4 | For the purpose to make performance comparison with user space IOAT | |
| 5 | driver, we developed the test tool based on IOAT kernel driver, the | |
| 6 | test tool contains 2 components: kernel test module and user space | |
| 7 | application. The kernel test module allocated one kernel thread for | |
| 8 | each DMA channel, and the kernel thread did not pin to specified | |
| 9 | CPU cores, but ensure all the thread run in the same NUMA socket | |
| 10 | with DMA channel, and the user space application communicated | |
| 11 | with kernel test module via sysfs interface. | |
| 12 | ||
| 13 | Building & Usage | |
| 14 | ================ | |
| 15 | ||
| 16 | 1. Compile and load the kernel test module first. | |
| 17 | ||
| 18 | modprobe -v ioatdma | |
| 19 | ./scripts/build_kmod.sh build && insmod dmaperf.ko | |
| 20 | ||
| 21 | 2. Run the test application. | |
| 22 | ||
| 23 | Parameters: | |
| 24 | [-h usage] | |
| 25 | [-n number of DMA channels] | |
| 26 | [-q queue depth, per DMA channel] | |
| 27 | [-s [n^2] transfer size, per descriptor] | |
| 28 | [-t total [n^2] data to tranfer, per DMA channel] | |
| 29 | ||
| 30 | For example: ./ioat_kperf -n 4 -q 128 -s 12 -t 32 | |
| 31 | ||
| 32 | Total 4 Channels, Queue_Depth 128, Transfer Size 4096 Bytes, Total Transfer Size 4 GB | |
| 33 | Running I/O . . . . | |
| 34 | Channel 0 Performance Data 1414 MB/s | |
| 35 | Channel 1 Performance Data 1413 MB/s | |
| 36 | Channel 2 Performance Data 1413 MB/s | |
| 37 | Channel 3 Performance Data 1415 MB/s | |
| 38 | Total Channel Performance Data 5655 MB/s | |
| 39 | ||
| 40 | 3. Cleanup | |
| 41 | ./scripts/build_kmod.sh clean | |
| 42 | ||
| 43 | OS Support | |
| 44 | ========== | |
| 45 | We have tested several Linux distributions, currently Fedora 21/22 with kernel | |
| 46 | version >= 3.17 are supported. |