Dear all:
I/O speed of our guest VMs are so slow when uploading or downloading file
from them.
I have tried Basic and Advanced network, but I got the same result.
Our environment is :
CloudStack 4.2.1 + KVM Host(with rhel6.3 running on it).
But if I use CentOS 6.4 instead of rhel 6.3 as operating system of KVM host,
The I/O speed is normal.
Also, CloudStack 4.1.1 doesn't have this problem.The problem only occuring on
CloudStack 4.2 or later version
Here are my test data around different version of CloudStack deployment:
PS: Target VM are virtual machines on KVM Host with WEB or FTP service
CloudStack versionNetwork type of CloudStackKVM software versionOperating
system of KVMStorage type of VMOperating system of VMread/write speed of VM's
diskAverage speed when downloading file to PC of LAN from target VMAverage
speed when downloading file to target VM from server of LAN
4.1.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img version
0.12.1rhel6.3sharedrhel6.349.8 MB/sWEB:38.9 MB/s FTP:42.2 MB/sWEB:41.0 MB/s
FTP:31.7 MB/s
4.1.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img version
0.12.1rhel6.3localrhel6.3116 MB/sWEB:80.6 MB/s FTP:80.2 MB/sWEB:103 MB/s
FTP:64.1 MB/s
4.2.1BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img version
0.12.1rhel6.346.0 MB/sWEB:1.05 MB/s FTP:1 MB/sWEB:700 KB/s FTP:14 MB/s
4.2.1AdvancedQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img
version 0.12.1CentOS release 6.4 (Final)sharedrhel6.340.6 MB/sWEB:23.8
MB/sWEB:22.6 KB/s
4.2.1AdvancedQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img
version 0.12.1CentOS release 6.4 (Final)localrhel6.348.7 MB/sWEB:24.2 MB/s
FTP:24.5MB/sWEB:24.2 MB/s FTP:24.8MB/s
4.3BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img version
0.12.1rhel6.3sharedrhel6.335.9 MB/sWEB:218 KB/s FTP:211.9 KB/sWEB:811 KB/s
FTP:3.1 MB/s
4.3BasicQEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)；qemu-img version
0.12.2rhel6.3localrhel6.348.5 MB/sWEB:217 KB/s FTP:212.5 KB/sWEB:708 KB/s
FTP:3.0 MB/s
Any advice on how can I resolve the problem?
Looking forward to your reply, thank you.
Evan
Evan
Mail:evanitsh...@gmail.com
