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From: "Doug Smythies" <dsmythies@telus.net>
To: "'Rik van Riel'" <riel@surriel.com>
Cc: "'Linux PM'" <linux-pm@vger.kernel.org>,
	"'Frederic Weisbecker'" <fweisbec@gmail.com>,
	"'Thomas Gleixner'" <tglx@linutronix.de>,
	"'Paul McKenney'" <paulmck@linux.vnet.ibm.com>,
	"'Thomas Ilsche'" <thomas.ilsche@tu-dresden.de>,
	"'Aubrey Li'" <aubrey.li@linux.intel.com>,
	"'Mike Galbraith'" <mgalbraith@suse.de>,
	"'LKML'" <linux-kernel@vger.kernel.org>,
	"'Peter Zijlstra'" <peterz@infradead.org>,
	"'Rafael J. Wysocki'" <rjw@rjwysocki.net>,
	"Doug Smythies" <dsmythies@telus.net>
Subject: RE: [PATCH v2] cpuidle: poll_state: Add time limit to poll_idle()
Date: Thu, 22 Mar 2018 12:11:33 -0700	[thread overview]
Message-ID: <003f01d3c211$9a094e10$ce1bea30$@net> (raw)
In-Reply-To: z38ge3YFh1Konz38iel45g

On 2018.03.22 09:32 Rik van Riel wrote:
> On Wed, 2018-03-14 at 13:04 +0100, Peter Zijlstra wrote:
>
>> On x86 we don't have to use that time_check_counter thing,
>> sched_clock()
>> is really cheap, not sure if it makes sense on other platforms.
>
> Are you sure? I saw a 5-10% increase in CPU use,
> for a constant query rate to a memcache style
> workload, with v3 of this patch.

I would very much like to be able to repeat your test results.
However, I am not sure what you mean by "memcache style workload".
Is there a test you can point me to? Say a Phoronix type test, for example.

All of my tests with the V3 of this patch have been fine.

... Doug

  parent reply	other threads:[~2018-03-22 19:11 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-12  9:36 Rafael J. Wysocki
2018-03-14 11:24 ` Rafael J. Wysocki
2018-03-14 12:04 ` Peter Zijlstra
2018-03-14 12:08   ` Rafael J. Wysocki
2018-03-22 16:32   ` Rik van Riel
2018-03-22 19:11     ` Peter Zijlstra
2018-03-27 16:42     ` Rafael J. Wysocki
2018-03-27 18:02       ` Rik van Riel
2018-03-27 21:09         ` Rafael J. Wysocki
2018-03-22 19:11   ` Doug Smythies [this message]
2018-03-23  3:19   ` Doug Smythies
2018-03-23  8:57     ` Rafael J. Wysocki
2018-03-23  9:07       ` Rafael J. Wysocki
2018-03-23 21:30       ` Doug Smythies
2018-03-24 11:25         ` Rafael J. Wysocki

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