Tag Archives: buffering

Modify network buffers in Linux using sysctl

After installing Netdata I kept getting alerts that packets were being dropped. After some research I read you can alleviate this by increasing your system’s networking buffer. You can accomplish this with sysctl.

If you run sysctl manually it will not survive a reboot. If you want persistence you simply add the sysctl command line to /etc/sysctl.conf. Thanks to Brennen Smith on serverfault for the info on my particular problem with UDP drops:

#as root:
echo "net.core.rmem_default=8388608" >> /etc/sysctl.conf
echo "net.core.rmem_max=16777216" >> /etc/sysctl.conf
sysctl -p

The above solved my udp problem but you can modify it to change any sysctl things you want to quickly configure and persist.