my nginx is just a http tunul proxy http connection, and max connection is
just lower than 100.

# ps aux
root 19849 0.0 0.0 18028 2452 ? Ss 2012 0:00 nginx:
master process /usr/local/qqwebsrv/nginx/sbin/nginx
nobody 25389 0.1 0.0 19752 4104 ? S Mar25 9:07 nginx:
worker process
nobody 25390 0.1 0.0 19752 4104 ? S Mar25 9:03 nginx:
worker process
nobody 25391 0.1 0.0 19752 4108 ? S Mar25 8:46 nginx:
worker process
nobody 25392 0.1 0.0 19760 4116 ? S Mar25 8:58 nginx:
worker process

# lsof | grep nginx | grep socket
nginx 19849 root 3w unix 0xffff8102b7574380
1677964948 socket
nginx 19849 root 4u unix 0xffff81047e144f00
1677964949 socket
nginx 19849 root 6u unix 0xffff8102dce9dcc0
1677964950 socket
nginx 19849 root 7u unix 0xffff81047e532340
1677964951 socket
nginx 19849 root 8u unix 0xffff81027785a980
1677964954 socket
nginx 19849 root 9u unix 0xffff81047bd8ac80
1677964955 socket
nginx 19849 root 10u unix 0xffff8102b7574900
1677964957 socket
nginx 19849 root 12w unix 0xffff81010e285100
1677964958 socket
nginx 25389 nobody 3u unix 0xffff8102dce9dcc0
1677964950 socket
nginx 25389 nobody 4u unix 0xffff81047e144f00
1677964949 socket
nginx 25389 nobody 7u unix 0xffff81027785a980
1677964954 socket
nginx 25389 nobody 8u unix 0xffff8102b7574900
1677964957 socket
nginx 25390 nobody 3u unix 0xffff8102b7574380
1677964948 socket
nginx 25390 nobody 4u unix 0xffff81027785a980
1677964954 socket
nginx 25390 nobody 6u unix 0xffff8102b7574900
1677964957 socket
nginx 25390 nobody 7u unix 0xffff81047e532340
1677964951 socket
nginx 25391 nobody 3u unix 0xffff8102b7574380
1677964948 socket
nginx 25391 nobody 4u unix 0xffff8102b7574900
1677964957 socket
nginx 25391 nobody 6u unix 0xffff8102dce9dcc0
1677964950 socket
nginx 25391 nobody 9u unix 0xffff81047bd8ac80
1677964955 socket
nginx 25392 nobody 3u unix 0xffff8102b7574380
1677964948 socket
nginx 25392 nobody 6u unix 0xffff8102dce9dcc0
1677964950 socket
nginx 25392 nobody 8u unix 0xffff81027785a980
1677964954 socket
nginx 25392 nobody 12u unix 0xffff81010e285100
1677964958 socket

# lsof |awk '$1=="nginx" && $NF == "socket" {n[$6]=$7} END {for (i in n) {m
+= n[i]} print m / (1024 * 1024 * 1024)}'
12.5018

# netstat -na | grep ESTABLISHED | wc -l
87
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