Public bug reported: As I reported on https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05001.html
TL;DR: common Host size in CI's is 1-2G - for example Ubuntu Autopkgtests 1.5G Some of them run Guests of 0.5-1G size in TCG mode (as they often can't rely on having KVM available). Due to https://git.qemu.org/?p=qemu.git;a=commit;h=600e17b261555c56a048781b8dd5ba3985650013 in qmeu 5.0 the TB default size bumped from 32M to 1G. The 1G TB buffer + 0.5G actual guest size + there is no dynamic downsizing on memory pressure (never was) makes these systems go OOM- Killing the qemu process. Let us try to tune back the default size a bit again while the upstream discussion is ongoing. Currently affects in Ubuntu Groovy autopkgtest environment: - casper - open-iscsi - systemd - ubuntu-image ** Affects: qemu (Ubuntu) Importance: Undecided Assignee: Christian Ehrhardt (paelzer) Status: In Progress ** Tags: update-excuse ** Changed in: qemu (Ubuntu) Status: New => In Progress ** Changed in: qemu (Ubuntu) Assignee: (unassigned) => Christian Ehrhardt (paelzer) ** Tags added: update-excuse ** Description changed: As I reported on - https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05001.html + https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05001.html TL;DR: common Host size in CI's is 1-2G - for example Ubuntu Autopkgtests 1.5G Some of them run Guests of 0.5-1G size in TCG mode (as they often can't rely on having KVM available). Due to https://git.qemu.org/?p=qemu.git;a=commit;h=600e17b261555c56a048781b8dd5ba3985650013 in qmeu 5.0 the TB default size bumped from 32M to 1G. The 1G TB buffer + 0.5G actual guest size + there is no dynamic downsizing on memory pressure (never was) makes these systems go OOM- Killing the qemu process. Let us try to tune back the default size a bit again while the upstream discussion is ongoing. + + Currently affects in Ubuntu Groovy autopkgtest environment: + - casper + - open-iscsi + - systemd + - ubuntu-image -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1887763 Title: new default qemu TCG sizes exceed common CI setups To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1887763/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
