2a1596a4e9
Motivation:
When using Epoll based transport, allow applications to configure SO_BUSY_POLL socket option:
SO_BUSY_POLL (since Linux 3.11)
Sets the approximate time in microseconds to busy poll on a
blocking receive when there is no data. Increasing this value
requires CAP_NET_ADMIN. The default for this option is con‐
trolled by the /proc/sys/net/core/busy_read file.
The value in the /proc/sys/net/core/busy_poll file determines
how long select(2) and poll(2) will busy poll when they oper‐
ate on sockets with SO_BUSY_POLL set and no events to report
are found.
In both cases, busy polling will only be done when the socket
last received data from a network device that supports this
option.
While busy polling may improve latency of some applications,
care must be taken when using it since this will increase both
CPU utilization and power usage.
Modification:
Added SO_BUSY_POLL socket option
Result:
Able to configure SO_BUSY_POLL from Netty
52 lines
2.7 KiB
Java
52 lines
2.7 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel.epoll;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.unix.UnixChannelOption;
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import java.net.InetAddress;
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import java.util.Map;
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public final class EpollChannelOption<T> extends UnixChannelOption<T> {
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public static final ChannelOption<Boolean> TCP_CORK = valueOf(EpollChannelOption.class, "TCP_CORK");
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public static final ChannelOption<Long> TCP_NOTSENT_LOWAT = valueOf(EpollChannelOption.class, "TCP_NOTSENT_LOWAT");
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public static final ChannelOption<Integer> TCP_KEEPIDLE = valueOf(EpollChannelOption.class, "TCP_KEEPIDLE");
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public static final ChannelOption<Integer> TCP_KEEPINTVL = valueOf(EpollChannelOption.class, "TCP_KEEPINTVL");
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public static final ChannelOption<Integer> TCP_KEEPCNT = valueOf(EpollChannelOption.class, "TCP_KEEPCNT");
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public static final ChannelOption<Integer> TCP_USER_TIMEOUT =
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valueOf(EpollChannelOption.class, "TCP_USER_TIMEOUT");
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public static final ChannelOption<Boolean> IP_FREEBIND = valueOf("IP_FREEBIND");
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public static final ChannelOption<Boolean> IP_TRANSPARENT = valueOf("IP_TRANSPARENT");
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public static final ChannelOption<Boolean> IP_RECVORIGDSTADDR = valueOf("IP_RECVORIGDSTADDR");
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public static final ChannelOption<Integer> TCP_FASTOPEN = valueOf(EpollChannelOption.class, "TCP_FASTOPEN");
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public static final ChannelOption<Boolean> TCP_FASTOPEN_CONNECT =
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valueOf(EpollChannelOption.class, "TCP_FASTOPEN_CONNECT");
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public static final ChannelOption<Integer> TCP_DEFER_ACCEPT =
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ChannelOption.valueOf(EpollChannelOption.class, "TCP_DEFER_ACCEPT");
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public static final ChannelOption<Boolean> TCP_QUICKACK = valueOf(EpollChannelOption.class, "TCP_QUICKACK");
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public static final ChannelOption<Integer> SO_BUSY_POLL = valueOf(EpollChannelOption.class, "SO_BUSY_POLL");
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public static final ChannelOption<EpollMode> EPOLL_MODE =
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ChannelOption.valueOf(EpollChannelOption.class, "EPOLL_MODE");
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public static final ChannelOption<Map<InetAddress, byte[]>> TCP_MD5SIG = valueOf("TCP_MD5SIG");
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@SuppressWarnings({ "unused", "deprecation" })
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private EpollChannelOption() {
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}
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}
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