[Openstack-operators] [Quantum] scalability
ben42ml at gmail.com
Thu Jan 24 23:10:11 UTC 2013
Don't be scared about the scalability of openvswitch, we use it since
about 2 years with central network "gre-switch" (not in openstack but
with a good load of hypervisor/VMs)
Only one thing, for us, was the hardcoded size of the mac table ...
well we have modified a line in the source code, and it's ok :)
Gre tunnel is CPU consuming for network switch with limited cpu but for
a modern x86 cpu really don't care (and i speak for a 10Gbps network).
One thing about openstack vswitch agent : I have'nt see the ability to
specify the MTU for the gre Tunnel ?
Le 24/01/2013 16:27, Rohon Mathieu a écrit :
> with gre a full-mesh architecture is created. A lot of GRE interfaces
> are created, and i don't know how many interfaces are supported in
> this web page summarize scalability issue for cloudstack, but with ovs
> and GRE (in openstack, it's a single Mesh architecture):
> Moreover, a GRE doesn't use NIC offloading, it is very CPU consuming,
> it could be a possible issue at scale, with VM which flood the network
> With folsom, only one l3-agent is supported, which will do the SNAT
> and floating-ips. With a lot of VM accessing external network and a
> lot of floating-ips, this l3-agent could get down, but I don't know
> On Thu, Jan 24, 2013 at 12:47 PM, Vivek Singh Raghuwanshi
> <vivekraghuwanshi at gmail.com> wrote:
>> Hi Rohon,
>> i am running my openstack cloud with openvswitch with gre, can you clear
>> which information you want i am using 172.24.x.x and floating ips in the
>> ranve of 10.10.x.x
>> On Thu, Jan 24, 2013 at 4:03 PM, Rohon Mathieu <mathieu.rohon at gmail.com>
>>> I was wondering if someone has an experience to share about the
>>> scalability of the OVS/GRE solution.
>>> How many GRE tunnel are supported?
>>> How many connections throught l3-agent? How many floating-IP?
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>>> OpenStack-operators at lists.openstack.org
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