Messages in this thread | | | Date | Wed, 03 Nov 2010 13:27:18 -0500 | From | Karl Rister <> | Subject | Re: [RFC tg_shares_up improvements - v1 00/12] [RFC tg_shares_up - v1 00/12] Reducing cost of tg->shares distribution |
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Hi All
Here is a some performance data for the previously posted patches running a LAMP workload in a cloud-like environment which show promising reductions in CPU utilization. In this particular test, 32 groups equaling 64 KVM guests (each group consists of an Apache server guest and a MySQL server guest) are running a LAMP workload being driven by external load drivers. When using the default values in /etc/cgconfig.conf:
mount { cpuset = /cgroup/cpuset; cpu = /cgroup/cpu; cpuacct = /cgroup/cpuacct; memory = /cgroup/memory; devices = /cgroup/devices; freezer = /cgroup/freezer; net_cls = /cgroup/net_cls; blkio = /cgroup/blkio; }
which enable libvirt usage of cgroups the contents of /proc/cgroups looks like this before launching the guests:
#subsys_name hierarchy num_cgroups enabled cpuset 1 4 1 ns 0 1 1 cpu 2 4 1 cpuacct 3 4 1 memory 4 4 1 devices 5 4 1 freezer 6 4 1 net_cls 7 1 1 blkio 8 1 1
and like this after launching the guests:
#subsys_name hierarchy num_cgroups enabled cpuset 1 68 1 ns 0 1 1 cpu 2 68 1 cpuacct 3 68 1 memory 4 68 1 devices 5 68 1 freezer 6 68 1 net_cls 7 1 1 blkio 8 1 1
When running the workload the run with the patches used significantly less CPU:
Host CPU utilization with patches: 54.35% Host CPU utilization without patches: 80.89%
Since the workload uses a fixed injection rate the achieved throughput for both test runs was the same, however the run with the patches applied did achieve better quality of service metrics.
NOTE: The runs were made using kvm.git changeset cec8b6b972a572b69d4902f57fb659e8a4c749af.
-- Karl Rister <kmr@us.ibm.com>
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