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    SubjectRe: [RFC v2 PATCH 0/8] CFS Hard limits - v2
    Balbir Singh wrote:
    > * Pavel Emelyanov <xemul@openvz.org> [2009-09-30 17:36:29]:
    >
    >> Bharata B Rao wrote:
    >>> Hi,
    >>>
    >>> Here is the v2 post of hard limits feature for CFS group scheduler. This
    >>> RFC post mainly adds runtime borrowing feature and has a new locking scheme
    >>> to protect CFS runtime related fields.
    >>>
    >>> It would be nice to have some comments on this set!
    >> I have a question I'd like to ask before diving into the code.
    >> Consider I'm a user, that has a 4CPUs box 2GHz each and I'd like
    >> to create a container with 2CPUs 1GHz each. Can I achieve this
    >> after your patches?
    >
    > I don't think the GHz makes any sense, consider CPUs with frequency
    > scaling. If I can scale from 1.6GHz to say 2.6GHz or 2GHz to 4GHz,
    > what does it mean for hard limit control? Hard limits define control
    > over existing bandwidth, anything else would be superficial and hard
    > hard to get right for both developers and users.

    Two numbers for configuring limits make even less sense OTOH ;)
    By assigning 2GHz for 4GHz CPU I obviously want half of its power ;)
    Please, see my reply to vatsa@ in this thread.


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