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-id = 693
-title = "Qemu increased memory usage with TCG"
-state = "closed"
-created_at = "2021-10-27T13:03:16.267Z"
-closed_at = "2021-10-29T21:36:20.552Z"
-labels = ["Documentation", "accel: TCG"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/693"
-host-os = "Ubuntu 21.04, Debian 11, CentOS 8 Stream"
-host-arch = "x86"
-qemu-version = "QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-11+deb11u1)"
-guest-os = "Linux / Cirros 0.5.2"
-guest-arch = "x86"
-description = """The issue is that instances that are supposed to use only a small amount of memory (like 256MB) suddenly use a much higher amount of RSS when running the accel=tcg, around 512MB in the above example. This was not happening with qemu-4.2 (on Ubuntu 20.04). This is also not happening when using accel=kvm instead. The issue has been first noticed on Debian 11 (Bullseye) with the versions above, but it is happening in the same way on Centos 8 Stream, Ubuntu 21.10 and a pre-release version of Ubuntu 22.04. It also also seen when testing with qemu-6.1 built from source."""
-reproduce = """1. Deploy devstack (https://opendev.org/openstack/devstack) with VIRT_TYPE=qemu on a VM
-2. Start an instance with cirros image and a flavor allocating 256MB
-3. Do a ps and see a RSS size of about 512MB being used after the instance has finished booting
-4. Expected result (seen with qemu-4.2 or VIRT_TYPE=kvm): RSS stays < 256MB"""
-additional = """I can try to find a smaller commandline for manual reproduction if needed. The above sample is generated by OpenStack Nova via libvirt."""