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From: Alex Shi <alex.shi@intel.com>
To: Michael Wang <wangyun@linux.vnet.ibm.com>
Cc: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de,
	akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de,
	pjt@google.com, namhyung@kernel.org, efault@gmx.de,
	morten.rasmussen@arm.com, vincent.guittot@linaro.org,
	gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com,
	viresh.kumar@linaro.org, linux-kernel@vger.kernel.org,
	len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz,
	clark.williams@gmail.com, tony.luck@intel.com,
	keescook@chromium.org, mgorman@suse.de, riel@redhat.com
Subject: Re: [patch v3 0/8] sched: use runnable avg in load balance
Date: Wed, 03 Apr 2013 10:56:58 +0800	[thread overview]
Message-ID: <515B9A7A.6030807@intel.com> (raw)
In-Reply-To: <515B97FF.2040409@linux.vnet.ibm.com>

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

  reply	other threads:[~2013-04-03  2:57 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-02  3:23 [patch v3 0/8] sched: use runnable avg in load balance Alex Shi
2013-04-02  3:23 ` [patch v3 1/8] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" Alex Shi
2013-04-02  3:23 ` [patch v3 2/8] sched: set initial value of runnable avg for new forked task Alex Shi
2013-04-02  3:23 ` [patch v3 3/8] sched: only count runnable avg on cfs_rq's nr_running Alex Shi
2013-04-03  3:19   ` Alex Shi
2013-04-02  3:23 ` [patch v3 4/8] sched: update cpu load after task_tick Alex Shi
2013-04-02  3:23 ` [patch v3 5/8] sched: compute runnable load avg in cpu_load and cpu_avg_load_per_task Alex Shi
2013-04-02  3:23 ` [patch v3 6/8] sched: consider runnable load average in move_tasks Alex Shi
2013-04-09  7:08   ` Vincent Guittot
2013-04-09  8:05     ` Alex Shi
2013-04-09  8:58       ` Vincent Guittot
2013-04-09 10:38         ` Alex Shi
2013-04-09 11:56           ` Vincent Guittot
2013-04-09 14:48             ` Alex Shi
2013-04-09 15:16               ` Vincent Guittot
2013-04-10  2:31                 ` Alex Shi
2013-04-10  6:07     ` Michael Wang
2013-04-10  6:55       ` Vincent Guittot
2013-04-02  3:23 ` [patch v3 7/8] sched: consider runnable load average in effective_load Alex Shi
2013-04-02  3:23 ` [patch v3 8/8] sched: use instant load for burst wake up Alex Shi
2013-04-02  7:23 ` [patch v3 0/8] sched: use runnable avg in load balance Michael Wang
2013-04-02  8:34   ` Mike Galbraith
2013-04-02  9:13     ` Michael Wang
2013-04-02  8:35   ` Alex Shi
2013-04-02  9:45     ` Michael Wang
2013-04-03  2:46     ` Michael Wang
2013-04-03  2:56       ` Alex Shi [this message]
2013-04-03  3:23         ` Michael Wang
2013-04-03  4:28           ` Alex Shi
2013-04-03  5:38             ` Michael Wang
2013-04-03  5:53               ` Michael Wang
2013-04-03  6:01               ` Alex Shi
2013-04-03  6:22             ` Michael Wang
2013-04-03  6:53               ` Alex Shi
2013-04-03  7:18                 ` Michael Wang
2013-04-03  7:28                   ` Alex Shi
2013-04-03  8:46   ` Alex Shi
2013-04-03  9:37     ` Michael Wang
2013-04-03 11:17       ` Alex Shi
2013-04-07  3:09     ` Michael Wang
2013-04-07  7:30       ` Alex Shi
2013-04-07  8:56         ` Michael Wang
2013-04-09  5:08 ` Alex Shi
2013-04-10 13:12   ` Alex Shi

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