The maximum length of the listening queue for each port in the system.
2
"net.ipv4.tcp_max_syn_backlog"
8096
1000 - 3240000
int
The maximum length of tcp SYN queue length.
3
"net.core.rps_sock_flow_entries"
8192
1024 - 536870912
int
The maximum size of hash table for RPS.
4
"net.core.rmem_max"
16777216
212992 - 134217728
int
The maximum size, in bytes, of the receive socket buffer.
5
"net.core.wmem_max"
16777216
212992 - 134217728
int
The maximum size, in bytes, of the send socket buffer.
6
"net.ipv4.tcp_rmem"
"4096 12582912 16777216"
1024 - 2147483647
string
The min/default/max size of tcp socket receive buffer.
7
"net.ipv4.tcp_wmem"
"4096 12582912 16777216"
1024 - 2147483647
string
The min/default/max size of tcp socket send buffer.
8
"net.ipv4.neigh.default.gc_thresh1"
2048
128 - 80000
int
The minimum number of entries that can be retained. If the number of entries is less than this value, the entries will not be recycled.
9
"net.ipv4.neigh.default.gc_thresh2"
4096
512 - 90000
int
When the number of entries exceeds this value, the GC will clear the entries longer than 5 seconds.
10
"net.ipv4.neigh.default.gc_thresh3"
8192
1024 - 100000
int
Maximum allowable number of non-permanent entries.
11
"net.ipv4.tcp_max_orphans"
32768
4096 - 2147483647
int
Maximal number of TCP sockets not attached to any user file handle, held by system. Increase this parameter properly to avoid the 'Out of socket memory' error when the load is high.
12
"net.ipv4.tcp_max_tw_buckets"
32768
4096 - 2147483647
int
Maximal number of timewait sockets held by system simultaneously. Increase this parameter properly to avoid "TCP: time wait bucket table overflow" error.
Limit on the total number of fd, including socket, in the entire system.
2
"fs.inotify.max_user_instances"
8192
1024 - 2147483647
int
Limit on the total number of inotify instances.
3
"fs.inotify.max_user_watches"
524288
781250 - 2097152
int
The total number of inotify watches is limited. Increase this parameter to avoid "Too many open files" errors.
虚拟内存
以下设置可用于调整 Linux 内核虚拟内存 (VM) 子系统的操作以及向磁盘进行脏数据的 writeout。
编号
参数
默认值
允许的值 / 范围
参数类型
范围
1
"vm.max_map_count"
262144
65530 - 262144
int
The maximum number of memory map areas a process may have.
工作线程限制
编号
参数
默认值
允许的值 / 范围
参数类型
范围
1
"kernel.threads-max"
4194304
4096 - 4194304
int
The system-wide limit on the number of threads (tasks) that can be created on the system.
2
"kernel.pid_max"
4194304
4096 - 4194304
int
PIDs greater than this value are not allocated; thus, the value in this file also acts as a system-wide limit on the total number of processes and threads.
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