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    SubjectRe: volanoMark regression with kernel 2.6.26-rc1
    On Mon, May 12, 2008 at 09:39:10AM +0800, Zhang, Yanmin wrote:
    >
    > On Fri, 2008-05-09 at 21:22 +0530, Srivatsa Vaddagiri wrote:
    > > On Thu, May 08, 2008 at 11:41:25AM +0530, Srivatsa Vaddagiri wrote:
    > > > The other combination that I am interested to know is when:
    > > >
    > > > CONFIG_FAIR_GROUP_SCHED=y and CONFIG_CGROUP_SCHED=y
    > > >
    > > > [i.e cgroup based scheduling rather than uid based scheduling. Former
    > > > should result in only one group at bootup]
    > > >
    > > > I will also try to get some numbers with this combination.
    > >
    > > I ran with that combination and here are some results:
    > >
    > > 2.6.25 (with CONFIG_USER_SCHED)
    > >
    > > Volanomark perf = 20436.6 (Avg of 10 runs)
    > >
    > > 2.6.26-rc1 + patches in Ingo's tree [1] as of Fri morning IST (abt 8 hrs
    > > before) (with CONFIG_CGROUP_SCHED)
    > >
    > > Volanomark perf = 21529.6
    > >
    > > i.e CGROUP based grouping in 2.6.26-rc1 gives same (if not somewhat
    > > better) results as UID-based scheduling in 2.6.25.
    > >
    > > Yamin,
    > > Could you validate this as well? i.e just turn on cgroup-based
    > > grouping (CONFIG_CGROUP_SCHED) and check the resulting performance with 2625
    > > you already have (using CONFIG_USER_SCHED).
    > >
    > >
    > > A) In 2.6.25, with UID based scheduling,
    > > CPU load = summation of task load
    > >
    > > B) In 2.6.26-rc1, with UID based scheduling,
    > > CPU load = summation of group weights
    > >
    > > C) In 2.6.26-rc1, with CGROUP based scheduling,
    > > CPU load = summation of task weights
    > I'm confused by these conceptions. Would you like to tell me the exact config options
    > you want to turn on?
    >
    > Options in my config file(both 2.6.25 and 2.6.26-rc1):
    >
    > # CONFIG_CGROUPS is not set
    > CONFIG_GROUP_SCHED=y
    > CONFIG_FAIR_GROUP_SCHED=y
    > # CONFIG_RT_GROUP_SCHED is not set
    > CONFIG_USER_SCHED=y
    > # CONFIG_CGROUP_SCHED is not set
    >

    This is fine for 2.6.25. For 2.6.26-rc1, can you turn off USER_SCHED adn
    turn on CGROUP_SCHED?

    --
    regards,
    Dhaval


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