linux-kernel - Re: [patch v3 0/8] sched: use runnable avg in load balance

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Date:	Wed, 03 Apr 2013 10:56:58 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	morten.rasmussen@....com, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	len.brown@...el.com, rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com
Subject: Re: [patch v3 0/8] sched: use runnable avg in load balance

On 04/03/2013 10:46 AM, Michael Wang wrote:
> | 15 GB   |      16 | 45110 |   | 48091 |
> | 15 GB   |      24 | 41415 |   | 47415 |
> | 15 GB   |      32 | 35988 |   | 45749 |	+27.12%
> 
> Very nice improvement, I'd like to test it with the wake-affine throttle
> patch later, let's see what will happen ;-)
> 
> Any idea on why the last one caused the regression?

you can change the burst threshold: sysctl_sched_migration_cost, to see
what's happen with different value. create a similar knob and tune it.
+
+	if (cpu_rq(this_cpu)->avg_idle < sysctl_sched_migration_cost)
+		burst_this = 1;
+	if (cpu_rq(prev_cpu)->avg_idle < sysctl_sched_migration_cost)
+		burst_prev = 1;
+


BTW, what's the job thread behaviour of pgbench, guess it has lots of
wakeup. what's the work and sleep ratio of pgbench?
-- 
Thanks Alex
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