From: Nigel Cunningham <nigel@tuxonice.net>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@linux.jf.intel.com>,
Venkatesh Pallipadi <venki@google.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
ego@in.ibm.com, LKML <linux-kernel@vger.kernel.org>,
Dominik Brodowski <linux@dominikbrodowski.net>,
Nigel Cunningham <ncunningham@crca.org.au>
Subject: Re: [patch 0/7] sched: change nohz idle load balancing logic to push model
Date: Thu, 20 May 2010 21:07:42 +1000 [thread overview]
Message-ID: <4BF517FE.1000103@tuxonice.net> (raw)
In-Reply-To: <20100517182726.089700767@sbs-t61.sc.intel.com>
Hi.
I finally found the time to give this patch series a try. Minor updates
were required, but I'm now running it against 2.6.34.
"Load balancing tick" is still number one in my powertop list of top
causes of wakeups (sitting at ~60 to 80 per second as I type this, with
~170 wakeups per second total). Comparing this to the numbers I posted
earlier, we seem to have a win.
I do wonder, though, whether further work could still be done. If I take
one core offline, for example, I'm still getting load balancing ticks.
Intuitively, I'd expect there to be no need for them with only one core
available. But maybe I'm just ignorant of what's going on.
Regards,
Nigel
next prev parent reply other threads:[~2010-05-20 11:07 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-17 18:27 [patch 0/7] sched: change nohz idle load balancing logic to push model Suresh Siddha
2010-05-17 18:27 ` [patch 1/7] softirq: Add a no local fallback option to send_remote_softirq Suresh Siddha
2010-05-17 18:27 ` [patch 2/7] softirq: add init_remote_softirq_csd() Suresh Siddha
2010-05-17 18:27 ` [patch 3/7] softirq: avoid softirq_work_list for SCHED_SOFTIRQ when sent remotely Suresh Siddha
2010-05-20 8:12 ` Peter Zijlstra
2010-05-20 8:14 ` David Miller
2010-05-20 8:23 ` Jens Axboe
2010-05-20 8:29 ` Peter Zijlstra
2010-05-20 9:18 ` David Miller
2010-05-17 18:27 ` [patch 4/7] sched: Change nohz ilb logic from pull to push model Suresh Siddha
2010-06-01 23:47 ` Vaidyanathan Srinivasan
2010-06-02 22:27 ` Suresh Siddha
2010-05-17 18:27 ` [patch 5/7] sched: Change select_nohz_load_balancer to return void Suresh Siddha
2010-05-17 18:27 ` [patch 6/7] sched: change nohz.load_balancer to be nr_cpu_ids based Suresh Siddha
2010-05-20 9:49 ` Peter Zijlstra
2010-05-17 18:27 ` [patch 7/7] timers: use nearest busy cpu for migrating timers from an idle cpu Suresh Siddha
2010-06-01 23:37 ` Vaidyanathan Srinivasan
2010-06-02 22:02 ` Suresh Siddha
2010-05-17 22:39 ` [patch 0/7] sched: change nohz idle load balancing logic to push model Nigel Cunningham
2010-05-19 9:19 ` Dominik Brodowski
2010-05-20 10:50 ` Peter Zijlstra
2010-05-22 0:09 ` Suresh Siddha
2010-05-31 9:17 ` Peter Zijlstra
2010-06-09 10:13 ` [tip:sched/core] sched: Change " tip-bot for Venkatesh Pallipadi
2010-05-20 11:07 ` Nigel Cunningham [this message]
2010-05-20 11:17 ` [patch 0/7] sched: change " Dominik Brodowski
2010-05-20 11:35 ` Nigel Cunningham
2010-05-20 12:13 ` Dominik Brodowski
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