linux-kernel - Huge difference in reserved memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Thu, 23 Apr 2020 17:28:54 +0200
From:   Erik Rull <webmaster@...oftware.de>
To:     linux-kernel@...r.kernel.org
Subject: Huge difference in reserved memory - how to find?

Dear all,

I'm trying to move from 3.4.67 to 4.19 on a rather old Intel CPU and run into
some memory trouble I do not understand:

The point that confuses me is the difference in the following line:

3.4.67:
[    0.000000] Memory: 235736k/261056k available (4695k kernel code, 24872k
reserved, 2889k data, 564k init, 0k highmem)

4.19.82-rt30:
[    0.534687] Memory: 165244K/260668K available (9050K kernel code, 821K
rwdata, 2500K rodata, 808K init, 440K bss, 95424K reserved, 0K cma-reserved, 0K
highmem)

Why is so much memory reserved in the 4.19? I would like to understand why and
how I could reduce that. I need some more space on the system to let my
application run.

Thanks a lot!

Best regards,

Erik