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date [-d @int|str] [+%s|"+%F %T"]
netstat -ltunp
sar -n DEV 1

CentOS 1G以内内存调优

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echo 1 > /proc/sys/kernel/softlockup_panic

echo 0 > /proc/sys/net/mptcp/mptcp_enabled
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
echo 0 >  /proc/sys/net/ipv4/tcp_max_tw_buckets
echo "4096 16384 256000" > /proc/sys/net/ipv4/tcp_wmem
echo "4096 16384 256000" > /proc/sys/net/ipv4/tcp_rmem
echo 6 > /proc/sys/net/ipv4/tcp_retries2
echo 0 > /proc/sys/net/ipv4/tcp_syncookies
# echo 128 > /proc/sys/net/ipv4/tcp_max_syn_backlog

echo 99 > /proc/sys/vm/swappiness
service irqbalance stop

#rm -rf /usr/local/share/aliyun-assist/

system, centos

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