From: Andi Kleen <ak@muc.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: vatsa@in.ibm.com, schwidefsky@de.ibm.com, jdike@addtoit.com,
Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
Nick Piggin <nickpiggin@yahoo.com.au>,
rmk+lkml@arm.linux.org.uk, linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net
Subject: [uml-devel] Re: [RFC] (How to) Let idle CPUs sleep
Date: Sun, 8 May 2005 16:53:56 +0200 [thread overview]
Message-ID: <20050508145356.GB21873@muc.de> (raw)
In-Reply-To: <1115559855.5998.26.camel@laptopd505.fenrus.org>
On Sun, May 08, 2005 at 03:44:14PM +0200, Arjan van de Ven wrote:
>
> > But it has to be *really* lightweight because these transistion can
> > happen a lot (consider a CPU that very often goes to sleep for a short time)
>
> lightweight is good of course. But even if it's medium weight.. it just
> means you need to be REALLY idle (eg for longer time) for it to trigger.
> I guess we need some sort of per arch "idleness threshhold" for this.
The question is how useful it is for the hypervisor to even know that.
Why can't it just detect long idle periods by itself if it really wants?
-Andi
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WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@muc.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: vatsa@in.ibm.com, schwidefsky@de.ibm.com, jdike@addtoit.com,
Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
Nick Piggin <nickpiggin@yahoo.com.au>,
rmk+lkml@arm.linux.org.uk, linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [RFC] (How to) Let idle CPUs sleep
Date: 8 May 2005 16:53:56 +0200
Date: Sun, 8 May 2005 16:53:56 +0200 [thread overview]
Message-ID: <20050508145356.GB21873@muc.de> (raw)
In-Reply-To: <1115559855.5998.26.camel@laptopd505.fenrus.org>
On Sun, May 08, 2005 at 03:44:14PM +0200, Arjan van de Ven wrote:
>
> > But it has to be *really* lightweight because these transistion can
> > happen a lot (consider a CPU that very often goes to sleep for a short time)
>
> lightweight is good of course. But even if it's medium weight.. it just
> means you need to be REALLY idle (eg for longer time) for it to trigger.
> I guess we need some sort of per arch "idleness threshhold" for this.
The question is how useful it is for the hypervisor to even know that.
Why can't it just detect long idle periods by itself if it really wants?
-Andi
next prev parent reply other threads:[~2005-05-08 14:54 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-07 18:27 [uml-devel] [RFC] (How to) Let idle CPUs sleep Srivatsa Vaddagiri
2005-05-07 18:27 ` Srivatsa Vaddagiri
2005-05-08 3:50 ` [uml-devel] " Rusty Russell
2005-05-08 3:50 ` Rusty Russell
2005-05-08 4:14 ` [uml-devel] " Nick Piggin
2005-05-08 4:14 ` Nick Piggin
2005-05-08 12:19 ` [uml-devel] " Srivatsa Vaddagiri
2005-05-08 12:19 ` Srivatsa Vaddagiri
2005-05-09 6:27 ` [uml-devel] " Nick Piggin
2005-05-09 6:27 ` Nick Piggin
2005-05-12 8:38 ` Srivatsa Vaddagiri
2005-05-11 18:03 ` [uml-devel] " Tony Lindgren
2005-05-11 18:03 ` Tony Lindgren
2005-05-12 8:46 ` Srivatsa Vaddagiri
2005-05-12 16:01 ` Lee Revell
2005-05-12 16:16 ` Tony Lindgren
2005-05-12 16:28 ` Jesse Barnes
2005-05-12 17:12 ` Srivatsa Vaddagiri
2005-05-12 17:59 ` Jesse Barnes
2005-05-12 18:16 ` Tony Lindgren
2005-05-13 6:27 ` Srivatsa Vaddagiri
2005-05-12 18:08 ` Martin Schwidefsky
2005-05-12 18:21 ` Tony Lindgren
2005-05-13 6:23 ` Srivatsa Vaddagiri
2005-05-13 7:16 ` Nick Piggin
2005-05-13 8:04 ` Ingo Molnar
2005-05-13 8:27 ` Nick Piggin
2005-05-13 9:19 ` Srivatsa Vaddagiri
2005-05-13 9:33 ` Nick Piggin
2005-05-12 21:16 ` George Anzinger
2005-05-12 21:35 ` Jesse Barnes
2005-05-12 22:15 ` George Anzinger
2005-05-13 0:43 ` Jesse Barnes
2005-05-13 6:31 ` Srivatsa Vaddagiri
2005-06-30 12:47 ` Srivatsa Vaddagiri
2005-07-06 17:31 ` Srivatsa Vaddagiri
2005-05-08 10:13 ` [uml-devel] " Arjan van de Ven
2005-05-08 10:13 ` Arjan van de Ven
2005-05-08 13:33 ` [uml-devel] " Andi Kleen
2005-05-08 13:33 ` Andi Kleen
2005-05-08 13:44 ` [uml-devel] " Arjan van de Ven
2005-05-08 13:44 ` Arjan van de Ven
2005-05-08 14:53 ` Andi Kleen [this message]
2005-05-08 14:53 ` Andi Kleen
2005-05-08 13:31 ` [uml-devel] " Andi Kleen
2005-05-08 13:31 ` Andi Kleen
2005-05-08 15:26 ` [uml-devel] " Srivatsa Vaddagiri
2005-05-08 15:26 ` Srivatsa Vaddagiri
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