Include the memory overhead cost of cryptsetup when estimating the memory requirement for LUKS-encrypted target
Resolves: bz2076206
Upstream: Fedora
Conflict: None
commit 6ce4b85bb3ed6c97beda9ee4774e0924afbbf58a
Author: Coiby Xu <coxu@redhat.com>
Date: Mon Sep 5 18:08:44 2022 +0800
Include the memory overhead cost of cryptsetup when estimating the memory requirement for LUKS-encrypted target
Currently, "kdumpctl estimate" neglects the memory overhead cost of
cryptsetup itself. Unfortunately, there is no golden formula to
calculate the overhead cost [1]. So estimate the overhead cost as 50M
for aarch64 and 20M for other architectures based on the following
empirical data,
| Overhead (M) | OS | arch |
| ------------ | ----------------------------------------- | ------- |
| 14.1 | RHEL-9.2.0-20220829.d.1 | ppc64le |
| 14 | Fedora-37-20220830.n.0 Everything ppc64le | ppc64le |
| 17 | Fedora 36 | ppc64le |
| 8.8 | Fedora 35 | s390x |
| 10.1 | Fedora-Rawhide-20220829.n.0, fc38 | s390x |
| 42 | Fedora-Rawhide-20220829.n.0, fc38 | arch64 |
| 40 | F35 | arch64 |
| 42 | F36 | arch64 |
| 42 | Fedora-Rawhide-20220901.n.0 | arch64 |
| 10 | F35 | x86_64 |
| 10 | Fedora-Rawhide-20220901.n.0 | x86_64 |
| 11 | Fedora-Rawhide-20220901.n.0 | x86_64 |
[1] https://lore.kernel.org/cryptsetup/20220616044339.376qlipk5h2omhx2@Rk/T/#u
Fixes: e9e6a2c ("kdumpctl: Add kdumpctl estimate")
Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
