Why native epoll support is introduced in Netty?

Question

I believe Java's NIO library will use epoll on Linux machines. What are all the advantages of using Epoll instead of NIO on Linux machines.

Norman Maurer · Accepted Answer · 2017-11-20T18:21:32.160

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Netty's epoll transport uses epoll edge-triggered while java's nio library uses level-triggered. Beside this the epoll transport expose configuration options that are not present with java's nio like TCP_CORK, SO_REUSEPORT and more.

edited Nov 20 '17 at 18:21

answered May 05 '14 at 05:36

Norman Maurer

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Any reference for "java's nio library uses level-triggered"? – Amir Fo Mar 28 '20 at 22:49
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Just look at how its is implemented in the JDK. Also otherwise it would not work with the `Selector` interface. – Norman Maurer Mar 30 '20 at 11:14

score 3 · Answer 2 · answered Mar 08 '19 at 09:58

There are some information about this in netty's docs:

Netty provides the following platform specific JNI transports:
Linux (since 4.0.16)
MacOS/BSD (since 4.1.11)
These JNI transports add features specific to a particular platform, generate less garbage, and generally improve performance when compared to the NIO based transport.

Why native epoll support is introduced in Netty?

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