Openstack CPU/Disk/network QoS 功能
在openstack中Instance Recource Quota这个feature很早就加进来了，不过一直没有全部测试过这个feature。今天在havana版本中测试了一下这个功能。首先，这个feature在社区的wiki如下：
https://wiki.openstack.org/wiki/InstanceResourceQuota
测试过程中发现，这个wiki有些信息已经和代码匹配不上了。
从总体上来说这个feature的功能是通过cgroup和tc来实现的。cgroup限制CPU/Disk的IO，tc来限制network IO.
首先看一下CPU限制，目前支持一下参数：
quota:cpu_shares
quota:cpu_period
quota:cpu_quota
我仅测试了quota:cpu_period，测试步骤如下：
nova flavor-keytest_resource_quato set quota:cpu_period=110000
通过CLI设置了flavor的Extra Specs. 当然也可以通过dashboard设置，不过目前存在以下bug，虽然可以实际设进去，但是在dashboard上会重定向错误：
https://bugs.launchpad.net/horizon/+bug/1268860
然后使用这个flavor启动虚机，在计算节点上查看cgroup如下：
# pwd
/cgroup/cpu/libvirt/qemu/instance-00000010/vcpu0
# cat cpu.cfs_period_us
110000
# cd ../vcpu1/
# cat cpu.cfs_period_us
110000
默认的cpu period是100000，这里已经改成了110000，说明起作用了。
相关代码如下：
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L3012-3019
对于Network IO的测试我以前写过一个blog，在havana版本中没有太大的变化，只是tc的作用对象从vnetXX变为了tap设备。在此不再累述，可以参考以下blog：
http://blog.iyunv.com/matt_mao/article/details/15339729
另外目前支持的network IO的参数如下：
quota:vif_inbound_average
quota:vif_inbound_peak
quota:vif_inbound_burst
quota:vif_outbound_average
quota:vif_outbound_peak
quota:vif_outbound_burst
相关代码如下：
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/designer.py#L126-133
测试Disk IO时发现了以下错误日志：
2014-01-1603:25:18.9923158 ERROR nova.compute.manager Error: unsupported configuration: block I/O throttling not supported withthisQEMU binary
2014-01-1603:25:18.9923158 TRACE nova.compute.manager Traceback (most recent call last):
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1037, in _build_instance
2014-01-1603:25:18.9923158 TRACE nova.compute.manager set_access_ip=set_access_ip)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1410, in _spawn
2014-01-1603:25:18.9923158 TRACE nova.compute.manager LOG.exception(_('Instance failed to spawn'), instance=instance)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1407, in _spawn
2014-01-1603:25:18.9923158 TRACE nova.compute.manager block_device_info)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2070, in spawn
2014-01-1603:25:18.9923158 TRACE nova.compute.manager block_device_info, context=context)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 3205, in _create_domain_and_network
2014-01-1603:25:18.9923158 TRACE nova.compute.manager domain = self._create_domain(xml, instance=instance, power_on=power_on)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 3148, in _create_domain
2014-01-1603:25:18.9923158 TRACE nova.compute.manager domain.XMLDesc(0))
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 3143, in _create_domain
2014-01-1603:25:18.9923158 TRACE nova.compute.manager domain.createWithFlags(launch_flags)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/eventlet/tpool.py", line 187, in doit
2014-01-1603:25:18.9923158 TRACE nova.compute.manager result = proxy_call(self._autowrap, f, *args, **kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/eventlet/tpool.py", line 147, in proxy_call
2014-01-1603:25:18.9923158 TRACE nova.compute.manager rv = execute(f,*args,**kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib/python2.6/site-packages/eventlet/tpool.py", line 76, in tworker
2014-01-1603:25:18.9923158 TRACE nova.compute.manager rv = meth(*args,**kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager File"/usr/lib64/python2.6/site-packages/libvirt.py", line 708, in createWithFlags
2014-01-1603:25:18.9923158 TRACE nova.compute.manager ifret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager libvirtError: unsupported configuration: block I/O throttling not supported withthisQEMU binary
2014-01-1603:25:18.9923158 TRACE nova.compute.manager
可能由于qemu的bug，目前还不能正常工作。
https://www.redhat.com/archives/libvirt-users/2012-December/msg00008.html
版权声明：本文为博主原创文章，未经博主允许不得转载。
页:
[1]