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Diffstat (limited to 'results/classifier/105/graphic/693')
| -rw-r--r-- | results/classifier/105/graphic/693 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/results/classifier/105/graphic/693 b/results/classifier/105/graphic/693 new file mode 100644 index 00000000..2dcdf2aa --- /dev/null +++ b/results/classifier/105/graphic/693 @@ -0,0 +1,23 @@ +graphic: 0.891 +boot: 0.627 +device: 0.626 +instruction: 0.598 +semantic: 0.507 +network: 0.243 +mistranslation: 0.182 +vnc: 0.171 +other: 0.105 +socket: 0.101 +assembly: 0.024 +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. |