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IDProjectCategoryView StatusLast Update
0018006CentOS-8qemu-kvmpublic2021-01-11 01:05
Reporteralievertz-tai Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
Status newResolutionopen 
PlatformVMware Workstation 15.5.7OSCentOS 8OS Version8.3
Product Version8.3.2011 
Summary0018006: QEMU-KVM PXE boot takes 10x as long under kernel 4.18.0-240.1.1.el8_3.x86_64
DescriptionUsing qemu-kvm to boot a temporary (nested) VM under CentOS 8 on VMware Workstation 15.5.7 on Windows 10 2004 takes 10x as long to TFTP a kernel and initrd versus the last previous installed kernel, 4.18.0-193.28.1.el8_2.
Steps To ReproduceThese steps assume a PXE server is listening on the same network as the instantiated net dev, and has a kernel and initrd available for booting:

- Verify Windows version is 2004
- Install VMware Workstation 15.5.7
- Create/install a CentOS 8[.2?] VM with nested virtualization support and apply updates to reach kernel version 4.18.0-193.28.1.el8_2
- As root, run the following (or functionally equivalent) qemu-kvm command and establish the baseline time required to TFTP the kernel and initrd

/usr/libexec/qemu-kvm -m 4G -smp cpus=4 -M accel=kvm -enable-kvm -cpu host -chardev stdio,id=char0,mux=on,logappend=off,signal=off -serial chardev:char0 -mon chardev=char0 -nographic -boot n -net bridge,br=virbr0 -net nic,model=virtio

- Update CentOS updates to reach kernel version 4.18.0-240.1.1.el8_3 and reboot
- Re-run the same qemu-kvm command and note the time required to TFTP the kernel and initrd
Additional InformationI tried a different qemu-kvm command that uses the newer -netdev syntax, but this did not change the outcome.
Tagskernel, kernel bug, pxe, qemu, qemu-kvm, qemu-kvm KVM

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Issue History

Date Modified Username Field Change
2021-01-11 01:05 alievertz-tai New Issue
2021-01-11 01:05 alievertz-tai Tag Attached: kernel
2021-01-11 01:05 alievertz-tai Tag Attached: kernel bug
2021-01-11 01:05 alievertz-tai Tag Attached: pxe
2021-01-11 01:05 alievertz-tai Tag Attached: qemu
2021-01-11 01:05 alievertz-tai Tag Attached: qemu-kvm
2021-01-11 01:05 alievertz-tai Tag Attached: qemu-kvm KVM