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From Pierre-Luc Dion <pd...@cloudops.com>
Subject Re: Re: Why is the I/O speed of VM so terrible when using CloudStack4.2 + KVM deployment
Date Tue, 22 Jul 2014 02:48:20 GMT
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 <evanitsharp@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:evanitsharp@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 <evanitsharp@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:evanitsharp@gmail.com
>

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