linux-kernel - Re: [v2 PATCH 0/4] timers: framework for migration between CPU

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Date:	Wed, 4 Mar 2009 18:33:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	a.p.zijlstra@...llo.nl, ego@...ibm.com, tglx@...utronix.de,
	andi@...stfloor.org, venkatesh.pallipadi@...el.com,
	vatsa@...ux.vnet.ibm.com, arjan@...radead.org,
	svaidy@...ux.vnet.ibm.com
Subject: Re: [v2 PATCH 0/4] timers: framework for migration between CPU


* Arun R Bharadwaj <arun@...ux.vnet.ibm.com> wrote:

> $taskset -c 4,5,6,7 make -j4
> 
> my_driver queuing timers continuously on CPU 10.
> 
> idle load balancer currently on CPU 15
> 
> 
> Case1: Without timer migration		Case2: With timer migration
> 
>    --------------------			   --------------------
>    | Core | LOC Count |			   | Core | LOC Count |
>    | 4    |   2504    |			   | 4    |   2503    |
>    | 5    |   2502    |			   | 5    |   2503    |
>    | 6    |   2502    |			   | 6    |   2502    |
>    | 7    |   2498    |			   | 7    |   2500    |
>    | 10   |   2501    |			   | 10   |     35    |
>    | 15   |   2501    |			   | 15   |   2501    |
>    --------------------			   --------------------
> 
>    ---------------------		   --------------------
>    | Core | Sleep time |		   | Core | Sleep time |
>    | 4    |    0.47168 |		   | 4    |    0.49601 |
>    | 5    |    0.44301 |		   | 5    |    0.37153 |
>    | 6    |    0.38979 |		   | 6    |    0.51286 |
>    | 7    |    0.42829 |		   | 7    |    0.49635 |
>    | 10   |    9.86652 |		   | 10   |   10.04216 |
>    | 15   |    0.43048 |		   | 15   |    0.49056 |
>    ---------------------		   ---------------------
> 
> Here, all the timers queued by the driver on CPU10 are moved to CPU15,
> which is the idle load balancer.

The numbers with this automatic method based on the ilb-cpu look 
pretty convincing. Is this what you expected it to be?

	Ingo
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