Performance – Page 6

Monitoring PPS (Packets Per Second) in Zabbix

I will give an example of monitoring PPS (Packets Per Second) on network interfaces in Linux.
In order to calculate the number of transmitted packets per second on the network interface, create two simple scripts, the first to calculate the transmitted packets:

Suppression of DHCP servers (dhcdrop)

dhcdrop is a utility for suppressing unnecessary DHCP servers and stress testing.

Simple page caching

I will give an example of a simple caching of PHP pages with an interval of 600 seconds (10 minutes).

Paste at the beginning of the code:

Monitoring current RX and TX network interface buffers in Zabbix

One day after restarting the Ubuntu server, due to the long start of a large number of network interfaces, my script which increased the values of the buffers and also performed other settings was performed ahead of time, respectively, the changes did not apply and I found out about this problem only after 24 hours, so I decided monitor current RX and TX buffers.

How to change open_files_limit in MySQL

I will give an example of viewing and increasing the open_files_limit parameter in MySQL.
Will perform operations in the Ubuntu Server 16.04.

Solution «TX driver issue detected, PF reset issued»

Once on one high-load access server with about 5 Gb/s traffic in /var/log/syslog, errors began to appear frequently:

Installing and using innotop

innotop is a utility for monitoring the status of MySQL server.

I will give an example of installing innotop in Ubuntu. Since innotop is present in mysql-client, we install it and the necessary components:

PPS Viewer Script (Packets Per Second)

The script every second displays the number of incoming and outgoing packets per second on the specified network interface.
Place the contents of the script into a file, for example, pps.sh and execute by specifying the name of the network interface (you can stop the execution of the script with CTRL+C):

Changing CPU Scaling Governor on Linux

Through “Scaling Governor”, you can choose the optimal CPU frequency control scheme, which affects power consumption and performance.

On highly loaded access servers, acquaintances had cases of server hangup during “ondemand”, although I did not have such cases, but still I recommend changing it to “performance”.
On laptops and lightly loaded servers, you can leave “ondemand” to save energy.

BGP. Channel Balancing on Quagga

I will give an example of balancing only incoming traffic with two channels using Quagga.

On the test, I will use Ubuntu 16.04.4 LTS and Quagga 0.99.24.1, the network interface ens1f0 for the second provider with one neighbors and ens2f0 for the first provider with two neighbors, the local network will be connected to ens2f1. Both providers announce “default”.
3.3.3.0/23 this will be my network with white IP addresses.
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