RAM in Ubuntu. buff/cache?

Question

linux

Hello. Worth Xubuntu.
> top
> ...
KiB Mem : 8058772 total, 2526584 free, 2052188 used, 3480000 buff/cache
KiB Swap: 8388604 total, 8388604 free, 0 used. 6291260 avail Mem
....
It costs 8GB of RAM, of which 2.5GB is free and 2GB means used. And what is buff/cache for 3.4GB there?
this is normal? what is it in general and why does memory go to buff/cache

Answer 1

https://www.linuxatemyram.com/
What's going on?
Linux is borrowing unused memory for disk caching. This makes it looks like you are low on memory, but you are not! Everything is fine!
What is happening more?
Linux uses memory not occupied by programs to cache data from disks
Everything is ok!
https://www.google.com.ua/search?q=linux+what+taco...

Answer 2

this is normal?

Fine. The same is true in windows.

Answer 3

Linux uses this memory by pagecache. If you always need free RAM, then pull it out of the server and put it next to the table (c) Biryukov from Yandex
There is a good lecture from Yandex on how Linux works with memory. on youtube