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    SubjectRe: [RFC tg_shares_up improvements - v1 00/12] [RFC tg_shares_up - v1 00/12] Reducing cost of tg->shares distribution
    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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