linux-kernel - Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede

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Date:	Mon, 19 Sep 2011 17:38:26 -0700
From:	Venki Pallipadi <venki@...gle.com>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Paul Turner <pjt@...gle.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelianov <xemul@...allels.com>,
	Ken Chen <kenchen@...gle.com>
Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede

On Mon, Sep 19, 2011 at 10:51 AM, Kamalesh Babulal
<kamalesh@...ux.vnet.ibm.com> wrote:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2011-09-15 23:48:43]:
>
>> On Thu, 2011-09-15 at 23:25 +0530, Kamalesh Babulal wrote:
>> > 2.6.38          | 1551  | 48    | 62    | 47    | 50    |
>> > ----------------+-------+-------+-------+-------+-------+
>> > 2.6.39          | 3784  | 457   | 722   | 3209  | 1037  |
>>
>> I'd say we wrecked it going from .38 to .39 and only made it worse after
>> that.
>
> after reverting the commit 866ab43efd325fae8889ea, of the patches
> went between .38 and .39 reduces the ping pong of the tasks.

There was a side-effect from 866ab43efd325fae8889ea that Ken
identified and fixed later in commit
b0432d8f162c7d5d9537b4cb749d44076b76a783. I guess you are seeing the
same problem...

Thanks,
Venki
>
> ------------------------+-------+-------+-------+-------+-------+
> Kernel                  | Run 1 | Run 2 | Run 3 | Run 4 | Run 5 |
> ------------------------+-------+-------+-------+-------+-------+
> 2.6.39                  | 1542  | 2172  | 2727  | 120   | 3681  |
> ------------------------+-------+-------+-------+-------+-------+
> 2.6.39 (with            |       |       |       |       |       |
> 866ab43efd reverted)    | 65    | 78    | 58    | 99    | 62    |
> ------------------------+-------+-------+-------+-------+-------+
> 3.1-rc4+tip             |       |       |       |       |       |
> (e467f18f945c)          | 1219  | 2037  | 1943  | 772   | 1701  |
> ------------------------+-------+-------+-------+-------+-------+
> 3.1-rc4+tip (e467f18f9) |       |       |       |       |       |
> (866ab43efd reverted)   | 64    | 45    | 59    | 59    | 69    |
> ------------------------+-------+-------+-------+-------+-------+
>
> Thanks,
> Kamalesh.
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