After printing my thesis I realised that the spacing in the bottom and top of the document seem overly unbalanced (not an issue on pdf, but looks a bit odd in print, see figure in the bottom of the post), as shown by the red arrows in the picture below:
Would anyone know what the names of these lengths are, and how to change them? I would like to move the main body of the text down around 4mm, and the number line as well.
I'm using a tweaked template based on KOMA scrbook, and I'm not loading the geometry package (except for showing the frames in the figure below with \package[pass,showframe]{geometry}).


\headsepand\footskip. – Bernard Sep 03 '19 at 16:27koma-scriptand it has its own way the manage the page layout. The only mentioning of\headsepthat I found in the documentation was in the explanations about theheadsepkey, p. 404. – Bernard Sep 03 '19 at 16:42geometry. If you just want smaller margins, there are several possibilities to do that, depending on the details of what you want to achieve. Those are described in section 2.6 of the manual. – schtandard Sep 03 '19 at 19:04