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authorChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:23:11 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:23:11 +0000
commitc50b0c4da17b6e83640e4ed2380fffb5f507c846 (patch)
treeb4f203fce1380e2ea3578a784bb8ee060fe42cbd /results/classifier/zero-shot-user-mode/output/instruction/693
parent61361f925d4914a6608a0076e64cc2399311ed5f (diff)
downloadqemu-analysis-c50b0c4da17b6e83640e4ed2380fffb5f507c846.tar.gz
qemu-analysis-c50b0c4da17b6e83640e4ed2380fffb5f507c846.zip
add zero-shot results
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+instruction: 0.597
+syscall: 0.217
+runtime: 0.186
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+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.