Re: [PATCH] sched: Introduce scaled capacity awareness in enqueue

From: Rohit Jain
Date: Fri Jun 02 2017 - 14:18:32 EST



On 06/01/2017 05:37 AM, Peter Zijlstra wrote:
On Thu, Jun 01, 2017 at 02:28:27PM +0200, Peter Zijlstra wrote:
On Wed, May 31, 2017 at 03:19:46PM -0700, Rohit Jain wrote:

2) This scaled capacity is normalized and mapped into buckets.
Why?
And its not at all clear why you'd need
that to begin with.

Here is the problem I am trying to solve:

The benchmark(s) have a high degree of variance when run multiple
times.

We believe it is because of the scheduler not being aware of the scaled
down capacity of the CPUs because of IRQ/RT activity.

This patch helps in solving the above problem. Do you have any thoughts
on solving this problem in any other way?