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    SubjectRe: [PATCH 13/15] sched: add bandwidth management for sched_dl.
    On 05/29/2012 02:31 PM, Peter Zijlstra wrote:
    > On Tue, 2012-05-29 at 14:18 +0200, Juri Lelli wrote:
    >>> The thing is, keeping it separate makes for an impossible configuration
    >>> scenario. Esp. once we enable !root usage. The proposed 5% is very
    >>> limiting and regular users won't have sufficient privilege to change it.
    >> Ok, now I understand your point better, and I agree that 5% is hardly
    >> usable for !root users. However, I also think this is probably more a
    >> system admin problem. I mean, a sys admin that wants his users to play
    >> with -deadline scheduling should have thought how to properly set up his
    >> system, and the fact that something must be configured by hand to give
    >> users a usable system is generally not a so bad idea.
    > Yes, but lets not make the life of the unsuspecting admin harder than we
    > absolutely have to.
    > Furthermore we should strive to make DL as useful as possible
    > out-of-the-box.

    Ok, I agree on this.

    > One way to do this is to have rt and dl bandwidth constraints
    > independent and put a 3rd combined limit in place. But what is the
    > benefit of that over a single combined limit?

    In the end, a single limit is probably better. So, I'll leave rt_bandwidth
    at its default value and make dl_bandwidth a sort of sub-quota of it.
    To give the user an out-of-the-box usable system, I could raise dl_bandwith
    to, let's say, 40% (of 95%). Thus, in the default scenario, the user will
    be allowed to create _rt tasks up to 57% and _dl tasks up to 38% of the
    system capacity, sounds reasonable?

    Thanks and regards,

    - Juri

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