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Re: Re: [RFC] Virtualization steps [message #2321 is a reply to message #2295]

Wed, 29 March 2006 00:55

Kirill Korotaev
Messages: 137
Registered: January 2006

Senior Member

> Kirill Korotaev wrote:
>>> Oh, after you come to an agreement and start posting patches, can you
>>> also outline why we want this in the kernel (what it does that low
>>> level virtualization doesn't, etc, etc), and how and why you've agreed
>>> to implement it. Basically, some background and a summary of your
>>> discussions for those who can't follow everything. Or is that a faq
>>> item?
>> Nick, will be glad to shed some light on it.
>>
>> First of all, what it does which low level virtualization can't:
>> - it allows to run 100 containers on 1GB RAM
>> (it is called containers, VE - Virtual Environments,
>> VPS - Virtual Private Servers).
>> - it has no much overhead (<1-2%), which is unavoidable with hardware
>> virtualization. For example, Xen has >20% overhead on disk I/O.
>
> I think the Xen guys would disagree with you on this. Xen claims <3%
> overhead on the XenSource site.
>
> Where did you get these figures from? What Xen version did you test?
> What was your configuration? Did you have kernel debugging enabled? You
> can't just post numbers without the data to back it up, especially when
> it conflicts greatly with the Xen developers statements. AFAIK Xen is
> well on it's way to inclusion into the mainstream kernel.
I have no exact numbers in the hands as I'm in another country right now.
But! We tested Xen not long ago with iozone test suite and it gave
~20-30% disk I/O overhead. Recently we were testing CPU scheduler and
EDF scheduler gave me 33% overhead on some very simple loads with almost
busy loops inside VMs. It also was not providing any good fairness on
2CPU SMP system to my suprise. You can object to me, but better simply
retest it if interested yourself. There were other tests as well, which
reported very different overheads on Xen 3. I suppose Xen guys do such
measurements themself, no?
And I'm sure, they are constantly improving it, they are doing a good
work on it.

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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