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Re: Re: [RFC] Virtualization steps [message #2324 is a reply to message #2316]

Wed, 29 March 2006 09:13

Kirill Korotaev
Messages: 137
Registered: January 2006

Senior Member

Sam,

>> Why do you think it can not be measured? It either can be, or it is too
>> low to be measured reliably (a fraction of a per cent or so).
>
> Well, for instance the fair CPU scheduling overhead is so tiny it may as
> well not be there in the VServer patch. It's just a per-vserver TBF
> that feeds back into the priority (and hence timeslice length) of the
> process. ie, you get "CPU tokens" which deplete as processes in your
> vserver run and you either get a boost or a penalty depending on the
> level of the tokens in the bucket. This doesn't provide guarantees, but
> works well for many typical workloads.
I wonder what is the value of it if it doesn't do guarantees or QoS?
In our experiments with it we failed to observe any fairness. So I
suppose the only goal of this is too make sure that maliscuios user want
consume all the CPU power, right?

> How does your fair scheduler work? Do you just keep a runqueue for each
> vps?
we keep num_online_cpus runqueues per VPS.
Fairs scheduler is some kind of SFQ like algorithm which selects VPS to
be scheduled, than standart linux scheduler selects a process in a VPS
runqueues to run.

> To be honest, I've never needed to determine whether its overhead is 1%
> or 0.01%, it would just be a meaningless benchmark anyway :-). I know
> it's "good enough for me".
Sure! We feel the same, but people like numbers :)

Thanks,
Kirill

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[Message index]

		[RFC] Virtualization steps By: dev on Fri, 24 March 2006 17:19
		Re: [RFC] Virtualization steps By: Nick Piggin on Fri, 24 March 2006 17:33
		Re: [RFC] Virtualization steps By: Dave Hansen on Fri, 24 March 2006 19:25
		Re: [RFC] Virtualization steps By: ebiederm on Fri, 24 March 2006 19:53
		Re: [RFC] Virtualization steps By: Bill Davidsen on Tue, 28 March 2006 04:28
		Re: Re: [RFC] Virtualization steps By: kir on Tue, 28 March 2006 06:45
		Re: Re: [RFC] Virtualization steps By: Sam Vilain on Tue, 28 March 2006 21:59
		Re: Re: [RFC] Virtualization steps By: Kir Kolyshkin on Tue, 28 March 2006 22:24
		Re: Re: [RFC] Virtualization steps By: Sam Vilain on Tue, 28 March 2006 23:28
		Re: Re: [RFC] Virtualization steps By: Kirill Korotaev on Wed, 29 March 2006 09:13
		Re: Re: [RFC] Virtualization steps By: Sam Vilain on Wed, 29 March 2006 11:08
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Wed, 29 March 2006 13:45
		Re: Re: [RFC] Virtualization steps By: dev on Wed, 29 March 2006 14:47
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Wed, 29 March 2006 17:29
		Re: Re: [RFC] Virtualization steps By: Sam Vilain on Wed, 29 March 2006 21:37
		Re: Re: [RFC] Virtualization steps By: dev on Wed, 12 April 2006 08:22
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Thu, 13 April 2006 01:05
		Re: Re: [RFC] Virtualization steps By: Kirill Korotaev on Thu, 13 April 2006 06:45
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Thu, 13 April 2006 13:42
		Re: Re: [RFC] Virtualization steps By: Cedric Le Goater on Thu, 13 April 2006 21:33
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Thu, 13 April 2006 22:45
		Re: Re: [RFC] Virtualization steps By: dev on Fri, 14 April 2006 07:35
		Re: Re: [RFC] Virtualization steps By: Cedric Le Goater on Fri, 14 April 2006 09:56
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Sat, 15 April 2006 19:29
		Re: Re: [RFC] Virtualization steps By: kir on Thu, 13 April 2006 22:51
		Re: Re: [RFC] Virtualization steps By: Cedric Le Goater on Fri, 14 April 2006 10:08
		Re: Re: [RFC] Virtualization steps By: Herbert Poetzl on Sat, 15 April 2006 19:31
		Re: [RFC] Virtualization steps By: dev on Tue, 28 March 2006 09:00
		Re: [RFC] Virtualization steps By: Bill Davidsen on Tue, 28 March 2006 14:38
		Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 15:03
		Re: [RFC] Virtualization steps By: Jeff Dike on Tue, 28 March 2006 17:47
		Re: [RFC] Virtualization steps By: Sam Vilain on Tue, 28 March 2006 23:07
		Re: [RFC] Virtualization steps By: Bill Davidsen on Wed, 29 March 2006 20:56
		Re: Re: [RFC] Virtualization steps By: Jun OKAJIMA on Tue, 28 March 2006 20:26
		Re: Re: [RFC] Virtualization steps By: kir on Tue, 28 March 2006 20:50
		Re: Re: [RFC] Virtualization steps By: Jun OKAJIMA on Tue, 28 March 2006 21:35
		Re: Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 21:51
		Re: Re: [RFC] Virtualization steps By: Sam Vilain on Tue, 28 March 2006 23:17
		Re: [RFC] Virtualization steps By: dev on Tue, 28 March 2006 09:02
		Re: [RFC] Virtualization steps By: Nick Piggin on Tue, 28 March 2006 09:15
		Re: [RFC] Virtualization steps By: Herbert Poetzl on Tue, 28 March 2006 15:35
		Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 16:31
		Re: [RFC] Virtualization steps By: Nick Piggin on Tue, 28 March 2006 15:53
		Re: [RFC] Virtualization steps By: Bill Davidsen on Wed, 29 March 2006 21:37
		Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 16:15
		Re: [RFC] Virtualization steps By: dev on Wed, 29 March 2006 01:39
		Re: [RFC] Virtualization steps By: Herbert Poetzl on Wed, 29 March 2006 13:47
		Re: Re: [RFC] Virtualization steps By: TheWiseOne on Tue, 28 March 2006 15:48
		Re: Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 16:42
		Re: Re: [RFC] Virtualization steps By: TheWiseOne on Tue, 28 March 2006 17:04
		Re: Re: [RFC] Virtualization steps By: Kirill Korotaev on Wed, 29 March 2006 00:55
		Re: [RFC] Virtualization steps By: ebiederm on Fri, 24 March 2006 18:36
		Re: [RFC] Virtualization steps By: Herbert Poetzl on Fri, 24 March 2006 21:19
		Re: [RFC] Virtualization steps By: ebiederm on Mon, 27 March 2006 18:45
		Re: [RFC] Virtualization steps By: dev on Tue, 28 March 2006 08:51
		Re: [RFC] Virtualization steps By: serue on Tue, 28 March 2006 12:53
		Re: [RFC] Virtualization steps By: Sam Vilain on Tue, 28 March 2006 22:50
		Re: [RFC] Virtualization steps By: Dave Hansen on Wed, 29 March 2006 20:30
		Re: [RFC] Virtualization steps By: ebiederm on Wed, 29 March 2006 20:47
		Re: [RFC] Virtualization steps By: Sam Vilain on Wed, 29 March 2006 22:44
		Re: [RFC] Virtualization steps By: dev on Thu, 30 March 2006 13:51
		Re: [RFC] Virtualization steps By: ebiederm on Tue, 28 March 2006 21:58

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