Changes

to the [[UBC primary parameters|primary ones]] and can't be configured arbitrarily.

Size of unswappable memory in bytes, allocated by the operating system kernel.

This total limit is discussed in [[UBC systemwide configuration#“Low memory”|“low memory”]].

The total size of buffers used to send data over TCP network connections.

These socket buffers reside in [[UBC systemwide configuration#“Low memory”|“low memory”]].

This total limit is discussed in [[UBC systemwide configuration#“Low memory”|“low memory”]].

The total size of buffers used to temporary store the data coming from TCP network connections.

These socket buffers also reside in [[UBC systemwide configuration#“Low memory”|“low memory”]].

This total limit is discussed in [[UBC systemwide configuration#“Low memory”|“low memory”]].

The total size of buffers used by local (UNIX-domain) connections between

processes inside the system (such as connections to a local database server)

This total limit is discussed in [[UBC systemwide configuration#“Low memory”|“low memory”]].

The total size of buffers used to temporary store the incoming packets of UDP and

other datagram protocols.

This total limit is discussed in [[UBC systemwide configuration#“Low memory”|“low memory”]].

The guaranteed amount of memory for the case the memory is “over-booked”

(out-of-memory kill guarantee).

service and system daemons may be killed.

Memory allocation limit in [[Memory_page|pages]] (which are typically 4096 bytes in size).

There's also an article describing how [[user pages accounting]] works.

== System-wide limits ==