TCP Fast Open (TFO) on FreeBSD 12.0

TCP Fast Open (TFO) is an extension to speed up the opening of successive Transmission Control Protocol (TCP) connections between two endpoints. It works by using a TFO cookie (a TCP option), which is a cryptographic cookie stored on the client and set upon the...

PHP 7.3 Performance Benchmarks

Some fresh benchmarks over the past day on PHP 5.5.38, PHP 5.6.38, PHP 7.0.32, PHP 7.1.24, PHP 7.2.13, and the PHP 7.3.0 release. PHP 7.3 is just shy of 10% faster than PHP 7.2 in the popular PHPBench. PHP 7.3 is 31% faster than PHP 7.0 or nearly 3x the speed of...

MySQL command for finding all MyISAM databases

Today most popular storage engine in latests MySQL databases is InnoDB. But if you have older databases, before the times when InnoDB becomes the king, you must somehow convert your data. You can easy find which tables are using an older storage engine using: SELECT...

ZFS ARC memory size

On large zpools ZFS ARC memory occupies whole free ram on the machine and it starts swapping. It looks like that something is wrong and it needs some tuning.  Good results are archived after founding ZFS sysctl tunable vfs.zfs.arc_free_target to define how much memory...