Update F-Stack_Nginx_APP_Guide.md

Add description of directive  ```kernel_network_stack```.
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陈威 2018-01-26 21:44:05 +08:00 committed by GitHub
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@ -42,6 +42,15 @@ first one to start | | | | |
- a major addition to the worker process is fstack-handlingff_init();ff_run(worker_process_cycle); worker_process_cycle(handle channel/host/fstack event). - a major addition to the worker process is fstack-handlingff_init();ff_run(worker_process_cycle); worker_process_cycle(handle channel/host/fstack event).
- a new directive `kernel_network_stack` :
```
Syntax: kernel_network_stack on | off;
Default: kernel_network_stack off;
Context: http, server
This directive is available only when ```NGX_HAVE_FSTACK``` is defined.
Determines whether server should run on kernel network stack or fstack.
```
Note that: Note that:
- the `reload` is not graceful, service will still be unavailable during the process of reloading. - the `reload` is not graceful, service will still be unavailable during the process of reloading.