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

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Date:	Tue, 20 Sep 2011 16:39:38 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Venki Pallipadi <venki@...gle.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

* Venki Pallipadi <venki@...gle.com> [2011-09-19 17:38:26]:

> 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...
(snip)

3.1-rc4+tip includes the commit b0432d8f162c7d5d. The number of task
ping pongs has reduced with 3.1-rc4+tip, in comparison to 2.6.39 as 
seen in the below table. Reverting the commit 866ab43efd325fa on the 
3.1-rc4+tip reduces the task bouncing to a good extend.

> > ------------------------+-------+-------+-------+-------+-------+
> > 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    |
> > ------------------------+-------+-------+-------+-------+-------+
> >

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