### Environment
* Dubbo version: 2.7.0+
* Operating System version: ubuntu18.04.1 (virtual machine)
* Java version:
```
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-1ubuntu0.18.04.1-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)
```
1. Performance improvement scenario description
Support epoll capabilities.
system:
```
Linux ubuntu 4.15.0-39-generic #42-Ubuntu SMP Tue Oct 23 15:48:01 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
```
mem: free
```
total used free shared buff/cache available
Mem: 4015184 924876 1847772 8240 1242536 2816432
Swap: 2097148 265944 1831204
```
cpu: cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
```
4 Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
```
2. Optimized benchmark performance.
3. Unoptimized benchmark performance
refer from: https://github.com/apache/incubator-dubbo/issues/2508
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2737 ]
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