Openstack CPU/Disk/network QoS 功能

虚幻0516

　　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-key  test_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：
　　

[iyunv@ci91szcmp005vcpu0]# pwd
/cgroup/cpu/libvirt/qemu/instance-00000010/vcpu0
[iyunv@ci91szcmp005vcpu0]# cat cpu.cfs_period_us
110000
[iyunv@ci91szcmp005vcpu0]# cd ../vcpu1/
[iyunv@ci91szcmp005vcpu1]# 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 [req-8e364bca-9313-4c38-a900-34d2b7f3f700 ad3955246b8d45c8a808b83e4d51c246 88f530c7b2484336824c87801d6d4950] [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587] Error: unsupported configuration: block I/O throttling not supported withthisQEMU binary
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587] Traceback (most recent call last):
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     set_access_ip=set_access_ip)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     LOG.exception(_('Instance failed to spawn'), instance=instance)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     block_device_info)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     block_device_info, context=context)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     domain = self._create_domain(xml, instance=instance, power_on=power_on)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     domain.XMLDesc(0))
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     domain.createWithFlags(launch_flags)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   File"/usr/lib/python2.6/site-packages/eventlet/tpool.py", line 187, in doit
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     result = proxy_call(self._autowrap, f, *args, **kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   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 [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     rv = execute(f,*args,**kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   File"/usr/lib/python2.6/site-packages/eventlet/tpool.py", line 76, in tworker
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     rv = meth(*args,**kwargs)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]   File"/usr/lib64/python2.6/site-packages/libvirt.py", line 708, in createWithFlags
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]     ifret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587] libvirtError: unsupported configuration: block I/O throttling not supported withthisQEMU binary
2014-01-1603:25:18.9923158 TRACE nova.compute.manager [instance: ab6f99d6-06f4-4ea2-b4d3-fa3dce322587]


　　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


　　



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