Re: [PATCH] sched,numa: document and fix numa_preferred_nid setting

From: Rik van Riel
Date: Fri Jun 19 2015 - 13:52:40 EST

On 06/19/2015 01:16 PM, Srikar Dronamraju wrote:
>> OK, so we are looking at two multi-threaded processes
>> on a 4 node system, and waiting for them to converge?
>> It may make sense to add my patch in with your patch
>> 1/4 from last week, as well as the correct part of
>> your patch 4/4, and see how they all work together.
> Tested specjbb and autonumabenchmark on 4 kernels.
> Plain 4.1.0-rc7-tip (i)
> tip + only Rik's patch (ii)
> tip + Rik's ++ (iii)
> tip + Srikar's ++ (iv)

> 5 interations of Specjbb on 4 node, 24 core powerpc machine.
> Ran 1 instance per system.

Would you happen to have 2 instance and 4 instance SPECjbb
numbers, too? The single instance numbers seem to be within
the margin of error, but I would expect multi-instance numbers
to show more dramatic changes, due to changes in how workloads

Those behave very differently from single instance, especially
with the "always set the preferred_nid, even if we moved the
task to a node we do NOT prefer" patch...

It would be good to understand the behaviour of these patches
under more circumstances.

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