Inotify:

Increase inotify max user watches:

echo "fs.inotify.max_user_watches=524288" >> /etc/sysctl.d/40-max-user-watches.conf

Network

Increase netdev budget for squeezed packets, and netdev_max_backlog.

Add other optimizations for better performance.

[root]# nano /etc/sysctl.d/30-network-tuning.conf
# The maximum size of the receive queue. # The received frames will be stored in this queue after taking them from the ring buffer on the NIC. # Use high value for high speed cards to prevent loosing packets. net.core.netdev_max_backlog = 100000 net.core.netdev_budget=50000 # The upper limit on the value of the backlog parameter passed to the listen function. # Setting to higher values is only needed on a single highloaded server where new connection rate is high/bursty net.core.somaxconn = 16384 # The default and maximum amount for the receive/send socket memory # By default the Linux network stack is not configured for high speed large file transfer across WAN links. # This is done to save memory resources. # You can easily tune Linux network stack by increasing network buffers size for high-speed networks that connect server systems to handle more network packets. net.core.rmem_default = 1048576 net.core.wmem_default = 1048576 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.udp_rmem_min = 16384 net.ipv4.udp_wmem_min = 16384 # The maximum queue length of pending connections 'Waiting Acknowledgment' # In the event of a synflood DOS attack, this queue can fill up pretty quickly, at which point tcp_syncookies will kick in allowing your system to continue to respond to legitimate traffic, and allowing you to gain access to block malicious IPs. # If the server suffers from overloads at peak times, you may want to increase this value a little bit. net.ipv4.tcp_max_syn_backlog = 65536

Reload Sysctls

sysctl --system

References:

https://github.com/firehol/netdata/issues/1076

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