linux-kernel - Re: [PATCH v3 0/7] CFS Bandwidth Control

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Message-ID: <4CE3931D.1000403@cn.fujitsu.com>
Date:	Wed, 17 Nov 2010 16:32:29 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	bharata@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Pete@...per.es
Subject: Re: [PATCH v3 0/7] CFS Bandwidth Control

On 10/12/2010 03:49 PM, Bharata B Rao wrote:
> Hi,
> 
> Its been a while since we posted CPS hard limits (aka CFS bandwidth control
> now) patches, hence a quick recap first:
> 
> - I have been working on CFS hard limits since last year and have posted
>   a few versions of the same (last post: http://lkml.org/lkml/2010/1/5/44)
> - Paul Turner and Nikhil Rao meanwhile started working on CFS bandwidth
>   control and have posted a couple of versions.
>   (last post v2: http://lwn.net/Articles/385055/)
> 

Hi, All

	I tried it, it works very good! It adds a very useful feature.
It is very helpful for virtualization or cloud-computing I think.
I hope the next version patchset of it will be sent and get merged soon.

When I tested it, my box became dead several times, infrequently, and
I don't know how to reproduce it, but next steps may help to reproduce it:

# mount -t cgroup -o cpu xxx /mnt
# cd /mnt
# mkdir test
# cd test
# echo 5000000 > cpu.cfs_period_us
# echo 1000000 > cpu.cfs_quota_us
# cat /dev/zero > /dev/null &
# echo $! > tasks
# #make the system busy, browse websites and open many tabs in your browser etc
# #but do NOT do things important.
# #after some time, the system may dead. (can not respond even you type AltSysrqC)

Thank you all
Lai
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