Event channel performance optimize

Event channel performance optimize

[qiushanggao]

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I find the question:  inter-domain event only can be send to domain's vcpu0
in Xen, so that dom0's vcpu0 deal with the all domU's network and disk
request;  but my computer have 8 physical cpu;

anybody find the question? and anybody tell me how to optimize the question?


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Re: Event channel performance optimize

[Pasi Kärkkäinen]

On Fri, Apr 23, 2010 at 11:05:43PM +0800, qiushanggao wrote:
>    I find the question:  inter-domain event only can be send to domain's
>    vcpu0 in Xen, so that dom0's vcpu0 deal with the all domU's network and
>    disk request;  but my computer have 8 physical cpu;
> 
>    anybody find the question? and anybody tell me how to optimize the
>    question?

Maybe Keir can comment on this one..

-- Pasi

Re: Event channel performance optimize

[Keir Fraser]

On 26/04/2010 21:07, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:

> On Fri, Apr 23, 2010 at 11:05:43PM +0800, qiushanggao wrote:
>>    I find the question:  inter-domain event only can be send to domain's
>>    vcpu0 in Xen, so that dom0's vcpu0 deal with the all domU's network and
>>    disk request;  but my computer have 8 physical cpu;
>> 
>>    anybody find the question? and anybody tell me how to optimize the
>>    question?
> 
> Maybe Keir can comment on this one..

It's not true. An event can be delivered to any dom0 vcpu. They are
presented as a type of irq to the dom0 kernel, and hence normal Linux
load-balancing strategies such as irqbalanced will apply.

 -- Keir

Re: Event channel performance optimize

[Pasi Kärkkäinen]

On Mon, Apr 26, 2010 at 09:52:43PM +0100, Keir Fraser wrote:
> On 26/04/2010 21:07, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:
> 
> > On Fri, Apr 23, 2010 at 11:05:43PM +0800, qiushanggao wrote:
> >>    I find the question:  inter-domain event only can be send to domain's
> >>    vcpu0 in Xen, so that dom0's vcpu0 deal with the all domU's network and
> >>    disk request;  but my computer have 8 physical cpu;
> >> 
> >>    anybody find the question? and anybody tell me how to optimize the
> >>    question?
> > 
> > Maybe Keir can comment on this one..
> 
> It's not true. An event can be delivered to any dom0 vcpu. They are
> presented as a type of irq to the dom0 kernel, and hence normal Linux
> load-balancing strategies such as irqbalanced will apply.
> 

I think he meant domUs and dom0.. does the same apply to domUs? 

-- Pasi

Re: Event channel performance optimize

[Pasi Kärkkäinen]

On Tue, Apr 27, 2010 at 12:33:27AM +0300, Pasi Kärkkäinen wrote:
> On Mon, Apr 26, 2010 at 09:52:43PM +0100, Keir Fraser wrote:
> > On 26/04/2010 21:07, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:
> > 
> > > On Fri, Apr 23, 2010 at 11:05:43PM +0800, qiushanggao wrote:
> > >>    I find the question:  inter-domain event only can be send to domain's
> > >>    vcpu0 in Xen, so that dom0's vcpu0 deal with the all domU's network and
> > >>    disk request;  but my computer have 8 physical cpu;
> > >> 
> > >>    anybody find the question? and anybody tell me how to optimize the
> > >>    question?
> > > 
> > > Maybe Keir can comment on this one..
> > 
> > It's not true. An event can be delivered to any dom0 vcpu. They are
> > presented as a type of irq to the dom0 kernel, and hence normal Linux
> > load-balancing strategies such as irqbalanced will apply.
> > 
> 
> I think he meant domUs and dom0.. does the same apply to domUs? 
> 

+not

-- Pasi

Re: Event channel performance optimize

[Keir Fraser]

On 26/04/2010 22:33, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:

>> It's not true. An event can be delivered to any dom0 vcpu. They are
>> presented as a type of irq to the dom0 kernel, and hence normal Linux
>> load-balancing strategies such as irqbalanced will apply.
>> 
> 
> I think he meant domUs and dom0.. does the same apply to domUs?

The limitation to vcpu0 applies only to HVM domUs.

 -- Keir

答复: [Xen-devel] Event channel performance optimize

[qiushanggao]

I test it last week,  and I find your right;

Thanks Keir;

--Samgao

-----邮件原件-----
发件人: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
发送时间: 2010年4月27日 13:48
收件人: Pasi Kärkkäinen
抄送: qiushanggao; xen-devel@lists.xensource.com
主题: Re: [Xen-devel] Event channel performance optimize

On 26/04/2010 22:33, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:

>> It's not true. An event can be delivered to any dom0 vcpu. They are
>> presented as a type of irq to the dom0 kernel, and hence normal Linux
>> load-balancing strategies such as irqbalanced will apply.
>> 
> 
> I think he meant domUs and dom0.. does the same apply to domUs?

The limitation to vcpu0 applies only to HVM domUs.

 -- Keir