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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: Nick Piggin <npiggin@suse.de>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
	mingo@elte.hu, linux-kernel@vger.kernel.org, rostedt@goodmis.org
Subject: Re: [patch 2/2] sched: dynticks idle load balancing - v2
Date: Thu, 22 Feb 2007 14:33:00 -0800	[thread overview]
Message-ID: <20070222143259.B14789@unix-os.sc.intel.com> (raw)
In-Reply-To: <20070222032654.GD12137@wotan.suse.de>; from npiggin@suse.de on Thu, Feb 22, 2007 at 04:26:54AM +0100

On Thu, Feb 22, 2007 at 04:26:54AM +0100, Nick Piggin wrote:
> This is really ugly, sorry :(

hm. myself and others too thought it was a simple and nice idea.

> My suggestion for handling this was to increase the maximum balance
> interval for an idle CPU, and just implement a global shutdown when
> the entire system goes idle.
> 
> The former should take care of the power savings issues for bare metal
> hardware, and the latter should solve performance problems for many idle
> SMP guests. It should take very little code to implement.

coming to max balance interval will be challenging. It needs to save
power and at the same time respond to load changes fast enough.

> If that approach doesn't cut it, then at least we can have some numbers
> to see how much better yours is so we can justify including it.
> 
> If you are against my approach, then I can have a try at coding it up
> if you like?

Sure. If you can provide a patch, I will be glad to provide power and
performance comparision numbers with both the approaches.

thanks,
suresh

  reply	other threads:[~2007-02-22 23:08 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-11 23:53 [RFC] Patch: dynticks: idle load balancing Siddha, Suresh B
2006-12-13 22:43 ` Ingo Molnar
2006-12-13 23:13   ` Ingo Molnar
2006-12-13 23:03     ` Siddha, Suresh B
2006-12-13 23:31       ` Ingo Molnar
2006-12-13 23:19         ` Siddha, Suresh B
2006-12-14  0:34           ` Ingo Molnar
2006-12-19 20:12           ` Ingo Molnar
2006-12-19 21:12             ` Siddha, Suresh B
2007-01-16 11:35               ` Ingo Molnar
2007-01-30 21:57                 ` Siddha, Suresh B
2007-02-07 22:19                   ` Siddha, Suresh B
2007-02-17  2:03                   ` [patch 1/2] sched: fix idle load balancing in softirqd context Siddha, Suresh B
2007-02-17  2:08                     ` [patch 2/2] sched: dynticks idle load balancing - v2 Siddha, Suresh B
2007-02-21 20:23                       ` Andrew Morton
2007-02-22  3:14                         ` Nick Piggin
2007-02-24  2:01                         ` [patch] sched: dynticks idle load balancing - v3 Siddha, Suresh B
2007-02-22  3:26                       ` [patch 2/2] sched: dynticks idle load balancing - v2 Nick Piggin
2007-02-22 22:33                         ` Siddha, Suresh B [this message]
2007-02-23  3:43                           ` Nick Piggin
2007-02-17 14:42                     ` [patch 1/2] sched: fix idle load balancing in softirqd context Steven Rostedt
2007-02-21  6:25                       ` Siddha, Suresh B
2007-02-21 20:13                     ` Andrew Morton
2006-12-13 23:48     ` [RFC] Patch: dynticks: idle load balancing Ingo Molnar
2006-12-20  0:49 ` Steven Rostedt

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