IIRC, virtio wasn't the default until EL6.4. --David
On Sun, Jul 20, 2014 at 10:12 PM, evanitsharp <evanitsh...@gmail.com> wrote: > 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
