could it be possible it is the Global settings: network.throttling.rate and vm.network.throttling.rate ? what if you set them to 0 and restart systemvms,vr and Instances?
Pierre-Luc On Mon, Jul 21, 2014 at 9:20 PM, evanitsharp <evanitsh...@gmail.com> wrote: > Hi, David: > Thanks for your suggest. > But I had tested CloudStack4.1.1 + KVM(with rhel6.3)，the I/O speed was > normal. > > > Does anyone has any other advice? > Please tell me the details of step on how to solve the problem if possible > Thank you > > > > > Evan > > Mail:evanitsh...@gmail.com > > From: David Nalley > Date: 2014-07-21 12:43 > To: users@cloudstack.apache.org > CC: dev@cloudstack > Subject: Re: Why is the I/O speed of VM so terrible when using > CloudStack4.2 + KVM deployment > 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 >
