linux-kernel - Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults

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Date:	Fri, 01 Aug 2014 13:46:40 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Jirka Hladky <jhladky@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Aaron Lu <aaron.lu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [LKP] [sched/numa] a43455a1d57: +94.1%
 proc-vmstat.numa_hint_faults_local

On Thu, 2014-07-31 at 18:16 +0200, Jirka Hladky wrote:
> Peter, I'm seeing regressions for
> 
> SINGLE SPECjbb instance for number of warehouses being the same as total 
> number of cores in the box.
> 
> Example: 4 NUMA node box, each CPU has 6 cores => biggest regression is 
> for 24 warehouses.

By looking at your graph, that's around a 10% difference.

So I'm not seeing anywhere near as bad a regression on a 80-core box.
Testing single with 80 warehouses, I get:

tip/master baseline:
677476.36 bops
705826.70 bops
704870.87 bops
681741.20 bops 
707014.59 bops

Avg: 695385.94 bops

tip/master + patch (NUMA_SCALE/8 variant):
698242.66 bops
693873.18 bops 
707852.28 bops
691785.96 bops 
747206.03 bopsthis 

Avg: 707792.022 bops

So both these are pretty similar, however, when reverting, on avg we
increase the amount of bops a mere ~4%:

tip/master + reverted:
778416.02 bops 
702602.62 bops 
712557.32 bops 
713982.90 bops
783300.36 bops

Avg: 738171.84 bops

Are there perhaps any special specjbb options you are using?

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