RE: RE: [Xen-users] Bad network performance between VMs in a doma in.

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> zvoice@xxxxxxx
> Sent: 18 April 2007 12:31
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: FWD: RE: [Xen-users] Bad network performance between 
> VMs in a doma in.
> 
> Dual Core AMD Opteron(tm) Processor 280, 2 units. All configs 
> are native.

And how is the cores distributed between Dom0 and the two DomU's, are all using 
"any", or are the cores dedicated to a particular domain? If not, you may want 
to reduce the number of cores for Dom0 to 1 or 2, and set a dedicated core for 
each DomU. Setting Dom0 can be done with "xm vcpu-set" or modifying 
/etc/xen/xend-config.sxp (dom0-cpus n) where n is the number of CPU's for Dom0. 
If this number is zero, Dom0 has all CPU's in the system, and that will not be 
the ideal solution. 

Setting "cpus=[2-3]" or "cpu=2" in the config file will restrict which cores 
your DomU runs on. 

--
Mats
> 
> исходное сообщение
> Тема: RE: [Xen-users] Bad network performance between VMs in a domain.
> От:   zvoice@xxxxxxx
> Дата:         18.04.2007 11.15
> 
> In my next message i ll give you to your questions, but i 
> think the problem is when the packet comes from vif to bridge 
> and then from bridge to another vif. But what is strange, 
> that packets that pass through the vif to eth0 it goes with 
> the maximum speed, but when this packet is to be transmitted 
> from 1 vif to another in one vif it happens slowly.
> исходное сообщение
> Тема: RE: [Xen-users] Bad network performance between VMs in a domain.
> От:   zvoice@xxxxxxx
> Дата:         18.04.2007 10.01
> 
> I have got xen 3.0.3 and guests are in PVM
> 
> исходное сообщение
> Тема: [Xen-users] Bad network performance between VMs in a domain.
> От:   zvoice@xxxxxxx
> Дата:         18.04.2007 08.24
> 
> Hi!
> I have got this problem aching in my head. The speed between 
> my VM and 
> external machine is about 900Mb/s, but the speed between 2 
> VMs in one bridge 
> is just about 20 Mb/s. What can i do with this? Please, help me out.
> I ve got a standart Xen configuration(bridge).
> Thanks.  
> 
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