PIPEs and Named PIPEs (FIFO) Buffer size

Hello!
How I can increase or decrease predefined pipe buffer size?
System FreeBSD 4.9 and RedHat Linux 9.0

Thanks!

Suggest you find a book on tuning your specific OS.

Realize that changing parameters on the system could leave you in a non-bootable state. Proceed at your own risk.

See
Freebsd handbook
Freebsd config
Freebsd tuning
Freebsd sysctl

You can check out Redhat at Redhat Docs