Open Stack

Hi Openstack-users,

I am having a problem with I/O performance on VM running Oracle Linux 6,
I/O throughput on VM Oracle Linux 6 is much lower than VM using another OS
(Ubuntu, CentOS).

- VM Oracle Linux 6: throughput 40 MBps
https://prnt.sc/buKscX_qEtcF

- Other VM: throughput 113 MBps
https://prnt.sc/IRhBUPrGgLOy

- Test tool:
 dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasync; rm -f test


My Enviroment:
- Openstack: Ussuri
- Ceph: Octopus 15.2.8
- Compute: CentOS8_x86_64, kernel: 4.18.0-240.15.1.el8_3.x86_64
- KVM: qemu-kvm-5.2.0-16.el8.x86_64
- VM Oracle linux6: kernel-uek-4.1.12-124.42.3.el6uek.x86_64

I think because the kernel of Oracle Linux 6 is too old, maybe an older KVM
version could support it, and now KVM does not optimize for this OS.

Could you guy can help me with this?

-- 

*Lê Quang Long*

0942.533.683 | 0977.116.502
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