From: David Hildenbrand on gitlab.com https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1171#note_616124920
With kata-containers we run VMs as small as 256 MiB (or sometimes even smaller). However, in these setups, we run a stripped-down OS, so we can expect to kdump never to be installed/active (and IIUC, that implies that we never do a crashkernel reservation). At least that's what I assume. Note that [RHEL documents "Recommended minimum RAM" ](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/htm l/performing_a_standard_rhel_installation/system-requirements- reference_installing-rhel), with a note that "It is possible to complete the installation with less memory than the recommended minimum requirements. The exact requirements depend on your environment and installation path.". So it might work with more or less. I wouldn't be surprised if people are running 1GiB VMs with RHEL8; the question is, if these setups default-install kdump (I assume so?), and if we care for new versions of RHEL. On small VMs, we end up "wasting" a significant amount of memory on kdump reservations, which makes me believe that kdump isn't actually a good fit for small VMs at all, especially with newer RHEL kernels. So if we assume that people with less than 1.5G don't need kdump, why care at all about "we have another RHEL only patch to round up the memblock collected system ram size by 128M"? I don't immediately see why the switch from 1G-4G to 0G-4G is actually helpful and I'd just leave it like that and have kdump disabled for machines that have a memblock size < 1 GiB. Can you clarify what I am missing? _______________________________________________ kernel mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
