View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0018006 | CentOS-8 | qemu-kvm | public | 2021-01-11 01:05 | 2021-01-11 01:05 |
| Reporter | alievertz-tai | Assigned To | |||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | new | Resolution | open | ||
| Platform | VMware Workstation 15.5.7 | OS | CentOS 8 | OS Version | 8.3 |
| Product Version | 8.3.2011 | ||||
| Summary | 0018006: QEMU-KVM PXE boot takes 10x as long under kernel 4.18.0-240.1.1.el8_3.x86_64 | ||||
| Description | Using 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 Reproduce | These 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 Information | I tried a different qemu-kvm command that uses the newer -netdev syntax, but this did not change the outcome. | ||||
| Tags | kernel, kernel bug, pxe, qemu, qemu-kvm, qemu-kvm KVM | ||||
| 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 |
