| John DeNisco | 06dcd45 | 2018-07-26 12:45:10 -0400 | [diff] [blame] | 1 | .. _sysinfo: |
| 2 | |
| 3 | CPU |
| 4 | --- |
| 5 | |
| 6 | The CPU section of the system information is a summary of the CPU characteristics of the system. |
| 7 | It is important to understand the CPU topology and frequency in order to understand what the VPP |
| 8 | performance characteristics would be. |
| 9 | |
| 10 | Threads |
| 11 | ------- |
| 12 | |
| 13 | It usually is not needed, but VPP can be configured to run on isolated CPUs. In the example shown |
| 14 | VPP is configured with 2 workers. The main thread is also configured to run on a seperate CPU. The |
| 15 | stats thread will always run on CPU 0. This utilty will put the worker threads on CPUs that are |
| 16 | associated with the ports that are configured. |
| 17 | |
| 18 | Grub Command Line |
| 19 | ----------------- |
| 20 | |
| 21 | In general the Grub command line does not need to be changed. If the system is running many processes |
| 22 | it may be neccessary to isolate CPUs for VPP or other processes. |
| 23 | |
| 24 | Huge Pages |
| 25 | ---------- |
| 26 | |
| 27 | As default when VPP is configured the number of huge pages that will be configured will be 1024. |
| 28 | This may not be enough. This section will show the total system memory and how many are configured. |
| 29 | |
| 30 | |
| 31 | Devices |
| 32 | ------- |
| 33 | |
| 34 | In the devices section we have the "Total Number of Buffers". This utility allocates the correct |
| 35 | number of buffers. The number of buffers are calculated from the number of rx queues. |
| 36 | |
| 37 | VPP will not use links that are up. Those devices are shown with this utility. |
| 38 | |
| 39 | The devices bound to the kernel are not being used by VPP, but can be. |
| 40 | |
| 41 | The devices that are being used by VPP are shown with the interface name be used with VPP. The |
| 42 | socket being used by the VPP port is also shown. Notice in this example the worker thread are |
| 43 | on the correct CPU. The number of RX, TX Descriptors and TX queues are calculated from the number |
| 44 | of RX queues. |
| 45 | |
| 46 | |
| 47 | VPP Service Status |
| 48 | ------------------ |
| 49 | |
| 50 | The VPP service status, will be installed, not installed, running or not. |