What were you trying to do that didn't work?

• While running real-time guest with aio=native without fdsync() support, QEMU creates pthreads, and destroying these pthreads results in TLB flushes. In a real-time guest environment, TLB flushes result in latency spikes.

   

Please provide the package NVR for which bug is seen:

$ rpm -q qemu-kvm
qemu-kvm-8.0.0-16.el9_3.x86_64

How reproducible:

100%

Steps to reproduce

1.  Set up real-time host and guest environments
2.  Run oslat/cyclictests inside guest

Expected results

• Guest runs without latency spikes

Actual results

• Latency spikes are observed.