My buffer memory in server got increased after taking backups from multiple servers using rsync. This disk got almost full, removed the backups. As far as I understand buffers shoot up if we perform a lot of direct disk IO.The rsync was done, but buffer memory is still not freed up after around 8 hours.             total       used       free     shared    buffers     cachedMem:          7.7G       6.9G       761M      2.6M       3.7G       2.1G-/+ buffers/cache:       1.2G       6.5GSwap:         7.9G       411M       7.5GThis is a gaming test server, which is currently running. Is it safe to clear them? How to clear buffer without clearing cache?Also I am concerned about :: -/+ buffers/cache:       1.2G       6.5G . What is it?
Buffer memory increased
linux;memory;buffer
The system will automatically flush buffers and cache from memory when a process requires more memory to work with, so you don't need to do anything.Unused memory space is wasted space, so the kernel will load frequently used data to make it available faster.As for the +/- buffers/cache line, it shows what is actually used and available to you and is the line you should really be paying attention to. ;)