Regarding db performance improvement

Hi to PGDG TEAM

kernel.shmmax=18446744073692774399

kernel.shmall=18446744073692774399

I am using linux ubuntu server(16.04) to manage pgsql. So kernel default
value for kernel.shmax was 18446744073692774399 & kernel default value for
kernel.shmall was 18446744073692774399

I am using postgresql 12.1 version and ram was 32gb and 8 cpu's

1) Do i need to change the default values for kernel.shmmax &kernel.shmall
parameters by debugging this below script

Does pgsql have performance improvement well by changing the kernel.shmmax
and kernel.shmall default values ?
#!/bin/bash
# simple shmsetup script
page_size=`getconf PAGE_SIZE`
phys_pages=`getconf _PHYS_PAGES`
shmall=`expr $phys_pages / 2`
shmmax=`expr $shmall \* $page_size`
echo kernel.shmmax = $shmmax
echo kernel.shmall = $shmall

Regards
Durgamahesh Manne