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

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Message-ID: <20110913181245.GN11100@linux.vnet.ibm.com>
Date:	Tue, 13 Sep 2011 23:42:45 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Turner <pjt@...gle.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.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>
Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs
 unpinnede

* Peter Zijlstra <a.p.zijlstra@...llo.nl> [2011-09-13 20:03:04]:

> On Tue, 2011-09-13 at 23:24 +0530, Srivatsa Vaddagiri wrote:
> > Fyi, we have added additional levels to cgroup setup
> > (/Level1/Level2/C1/C1_1 etc) to mimic cgroup hierarchy for VMS as
> > created by libvirt. 
> 
> The deeper you nest the bigger the numerical problems get.. 
>
> Also, can you please stop using virt crap and focus on useful
> things? :-) 

That unfortunately is the target environment where we want this working
(want to cap VMs under KVM) :-) For simplicity, we have been playing
with non-VM based testcase ..

> Start with simple cases of single depth groups.

We did try with single level and "extra" large proportional
shares (10k * NR_TASKS if I recall)..I don't think they made any 
difference ..will re-check though.

- vatsa

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