Re: [PATCH v2] sched/fair: add burst to cgroup cpu bandwidth controller

[Konstantin Khlebnikov]

On 17/02/2020 22.56, Dave Chiluk wrote:
> On Fri, Feb 14, 2020 at 12:55 PM <bsegall@xxxxxxxxxx> wrote:
> > I'm not sure that starting with full burst runtime is best, though it
> > definitely seems likely to be one of those things where sometimes it's
> > what you want and sometimes it's not.
>
> We (Indeed) definitely want to start with a full burst bank in most
> cases, as this would help with slow/throttled start-up times for our
> Jitted and interpreter-based language applications.  I agree that it
> would be nice to have it be configurable.
>
> Dave.
> fyi.  Unfortunately, this e-mail may be temporarily turned off for the
> next few weeks, I apologize in advance for any bounced messages to me.

How much burst time you are planning to use?

On our side common setup should be like this:

cpu.cfs_period_us = 100ms
cpu.cfs_quota_us = 100ms * X
cpu.cfs_burst_us = clamp(400ms * X, 100ms, 100ms * NR_CPUS)

Where is X is a cpu power in cpus.