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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/108/other/693
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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-graphic: 0.891
-performance: 0.851
-boot: 0.627
-device: 0.626
-semantic: 0.507
-debug: 0.273
-network: 0.243
-PID: 0.232
-permissions: 0.214
-vnc: 0.171
-other: 0.105
-socket: 0.101
-files: 0.011
-KVM: 0.006
-
-Qemu increased memory usage with TCG
-Description of problem:
-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.
-Steps to 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 information:
-I can try to find a smaller commandline for manual reproduction if needed. The above sample is generated by OpenStack Nova via libvirt.