On 08/09/2013 08:32 PM, Edison Su wrote:
There is another issue, there is no way to change io speed from UI for system
vm's guest network(nic2) in basic network model, which will impact all the
template downloading in a negatively way.
We'd better don't throttle system vm's io speed by default, or at least give
admin the way to change the io speed.
I'd say for now, do not throttle System VMs.
You mainly want to throttle user Instances to prevent them from clogging
up the network.
Wido
-----Original Message-----
From: Edison Su [mailto:edison...@citrix.com]
Sent: Friday, August 09, 2013 11:27 AM
To: dev@cloudstack.apache.org
Subject: RE: [DISCUSS] KVM io throttling
-----Original Message-----
From: Wido den Hollander [mailto:w...@widodh.nl]
Sent: Friday, August 09, 2013 2:41 AM
To: dev@cloudstack.apache.org
Subject: Re: [DISCUSS] KVM io throttling
On 08/09/2013 02:05 AM, Edison Su wrote:
Hi All,
For basic network, the io limit for guest network(nic 2) is
200MB/s, we
set the io limit on kvm host as:
I think you mean 200Mbit/s?
Oh, I see, it's 200Mb/s.
</interface>
<interface type='bridge'>
<source bridge='cloudbr0'/>
<mac address='06:45:c4:00:00:0c'/>
<model type='virtio'/>
<bandwidth>
<inbound average='25600' peak='25600'/> <outbound average='25600'
peak='25600'/> </bandwidth> </interface>
From libvirt doc(http://libvirt.org/formatnetwork.html), it says
above unit
is KB/s, but per my testing, it sounds like it's Kb/s. Is there
anybody have the same issue?
No, my testing tells me it's is KB/sec (KiloByte).
On centos 6.3 + libvirt 0.9.10, the number doesn't match:
With the following simple test:
dd if=/dev/zero of=some-nfs-mount-point bs=1M count=10 I can get 104
MB/s if nic2 speed is unlimited, while only get 1MB/s, if nic2 is configured
with <bandwidth>
<inbound average='25600' peak='25600'/>
<outbound average='25600' peak='25600'/>
</bandwidth>
Maybe it's an issue on Centos 6.3?
My libvirt version is 0.9.10 on Centos 6.3.
My libvirt version is 1.0.6 under Ubuntu 12.04 using the Cloud Archive
for OpenStack Havana from Canonical:
https://wiki.ubuntu.com/ServerTeam/CloudArchive
Wido
