Comment 28 for bug 1950916

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Lee Yarwood (lyarwood) wrote : Re: master and wallaby check/gate/periodic tests are failing tempest - updated libvirt/qemu to 6.1 from CentOS appstream

Along with using q35 these jobs are also using accel=tcg ([libvirt]virt_type=qemu) and might be seeing increased memory pressure during tempest runs due to https://bugs.launchpad.net/nova/+bug/1949606 (QEMU >= 5.0.0 with -accel tcg uses a tb-size of 1GB causing OOM issues in CI) . Others have already ruled that out as an underlying cause here but I think we should keep it in mind here especially when combined with q35.