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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	David Lang <david@lang.hm>,
	"len.brown@intel.com" <len.brown@intel.com>,
	"alex.shi@intel.com" <alex.shi@intel.com>,
	"corbet@lwn.net" <corbet@lwn.net>,
	"peterz@infradead.org" <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"efault@gmx.de" <efault@gmx.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
	"preeti@linux.vnet.ibm.com" <preeti@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"pjt@google.com" <pjt@google.com>, Ingo Molnar <mingo@kernel.org>
Subject: Re: power-efficient scheduling design
Date: Tue, 25 Jun 2013 07:59:08 +1000	[thread overview]
Message-ID: <1372111148.3944.161.camel@pasglop> (raw)
In-Reply-To: <51C8651D.4010607@linux.intel.com>

On Mon, 2013-06-24 at 08:26 -0700, Arjan van de Ven wrote:
> 
> to bring the system back up if all cores in the whole system are idle and power gated,
> memory in SR etc... is typically < 250 usec (depends on the exact version
> of the cpu etc). But the moment even one core is running, that core will keep the system
> out of such deep state, and waking up a consecutive entity is much faster
> 
> to bring just a core out of power gating is more in the 40 to 50 usec range

Out of curiosity, what happens to PCIe when you bring a package down
like this ?

Cheers,
Ben.



  reply	other threads:[~2013-06-24 22:00 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-30 13:47 [RFC] Comparison of power-efficient scheduling patch sets Morten Rasmussen
2013-05-31  1:17 ` Alex Shi
2013-05-31  8:23   ` Alex Shi
2013-05-31 10:52 ` power-efficient scheduling design Ingo Molnar
2013-06-03 14:59   ` Arjan van de Ven
2013-06-03 15:43     ` Ingo Molnar
2013-06-04 15:03   ` Morten Rasmussen
2013-06-07  6:26     ` Preeti U Murthy
2013-06-20 15:23     ` Ingo Molnar
2013-06-05  9:56   ` Amit Kucheria
2013-06-07  6:03   ` Preeti U Murthy
2013-06-07 14:51     ` Catalin Marinas
2013-06-07 18:08       ` Preeti U Murthy
2013-06-07 17:36         ` David Lang
2013-06-09  4:33           ` Preeti U Murthy
2013-06-08 11:28         ` Catalin Marinas
2013-06-08 14:02           ` Rafael J. Wysocki
2013-06-09  3:42             ` Preeti U Murthy
2013-06-09 22:53               ` Catalin Marinas
2013-06-10 16:25               ` Daniel Lezcano
2013-06-12  0:27                 ` David Lang
2013-06-12  1:48                   ` Arjan van de Ven
2013-06-12  9:48                     ` Amit Kucheria
2013-06-12 16:22                       ` David Lang
2013-06-12 10:20                     ` Catalin Marinas
2013-06-12 15:24                       ` Arjan van de Ven
2013-06-12 17:04                         ` Catalin Marinas
2013-06-12  9:50                   ` Daniel Lezcano
2013-06-12 16:30                     ` David Lang
2013-06-11  0:50               ` Rafael J. Wysocki
2013-06-13  4:32                 ` Preeti U Murthy
2013-06-09  4:23           ` Preeti U Murthy
2013-06-07 15:23     ` Arjan van de Ven
2013-06-14 16:05   ` Morten Rasmussen
2013-06-17 11:23     ` Catalin Marinas
2013-06-18  1:37     ` David Lang
2013-06-18 10:23       ` Morten Rasmussen
2013-06-18 17:39         ` David Lang
2013-06-19 12:39           ` Morten Rasmussen
2013-06-18 15:20     ` Arjan van de Ven
2013-06-18 17:47       ` David Lang
2013-06-18 19:36         ` Arjan van de Ven
2013-06-19 15:39         ` Arjan van de Ven
2013-06-19 17:00           ` Morten Rasmussen
2013-06-19 17:08             ` Arjan van de Ven
2013-06-21  8:50               ` Morten Rasmussen
2013-06-21 15:29                 ` Arjan van de Ven
2013-06-21 15:38                 ` Arjan van de Ven
2013-06-21 21:23                   ` Catalin Marinas
2013-06-21 21:34                     ` Arjan van de Ven
2013-06-23 23:32                       ` Benjamin Herrenschmidt
2013-06-24 10:07                         ` Catalin Marinas
2013-06-24 15:26                         ` Arjan van de Ven
2013-06-24 21:59                           ` Benjamin Herrenschmidt [this message]
2013-06-24 23:10                             ` Arjan van de Ven
2013-06-18 19:06       ` Catalin Marinas
2013-06-21 15:06       ` Morten Rasmussen
2013-06-23 10:55         ` Ingo Molnar

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