-
Story
-
Resolution: Done-Errata
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Normal
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rhel-9.4, rhel-9.5, rhel-10.0
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qemu-kvm-9.0.0-5.el9
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FutureFeature, ZStream
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rhel-sst-virtualization-storage
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ssg_virtualization
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24
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None
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False
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None
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Red Hat Enterprise Linux
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None
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Approved Blocker
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Pass
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None
-
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x86_64
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None
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
- Set up real-time host and guest environments
- Run oslat/cyclictests inside guest
Expected results
- Guest runs without latency spikes
Actual results
- Latency spikes are observed.
- is cloned by
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RHEL-51901 qemu-kvm: linux-aio: add support for IO_CMD_FDSYNC command[RHEL-10]
- Release Pending
- links to
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RHSA-2024:131023 qemu-kvm bug fix and enhancement update