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Re: Re: [Xen-devel] Why the credit scheduler of xen-3.2.0 can ensure theI/O fairness?



Hi, Xiang

  tickling itself exists in first version of credit scheduler. 

changeset: New weighted fair-share CPU scheduler w/ automatic SMP load balancing
changeset 10168:        e539abd27a0f
http://xenbits.xensource.com/xen-unstable.hg?rev=10168

Please check Table.1 and Section4.2 of your citation.

Thanks
Atsushi SAKAI


"zhangxiang" <zhangxiang@xxxxxxxxxx> wrote:

> Hello Atsushi:
> 
> Thank you very much for your reply!
> I have already read that patch. In the paper "Scheduling I/O in Virtual 
> Machine Monitors", the author said that fixing event channel notification can 
> only ensure the I/O fairness with the tickling scheduler disable, and the 
> scheduler tickling is the culprit of the I/O unfairness even the event 
> channel code is fixed (Please see the Section 6.1). Although Xen-3.2.0 have 
> fixxed the event channel code, it does not disable the scheduler tickling. So 
> I think there should be something else xen-3.2.0 has done.
> Thank you again for your help.
> 
> Xiang ZHANG
> National Research Center for Intelligent Computing Systems
> Institute of Computing Technology, Chinese Academy of Sciences, Beijing,
> P.R.China
> 
> 
> 
> 
> 
> キ「シ扤優辧廛\xB3 Atsushi SAKAI
> キ「ヒヘハアシ茱コ 2008-05-26 09:56:35
> ハユシ扤優辧廛\xB3 zhangxiang
> ウュヒヘ」コ xen-devel
>
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