Re: [Xen-users] x64 hvm linux very slow on a x64 xen host

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Jan 20, 2010 at 01:06:32PM +0300, Matthieu Patou wrote:
> On 20/01/2010 12:47, Pasi Kärkkäinen wrote:
>> On Wed, Jan 20, 2010 at 11:30:37AM +0300, Matthieu Patou wrote:
>>    
>>> Hello,
>>>
>>> I'm trying to use Fedora x64 on a xen x64 host in hvm mode and the domU
>>> is _very_ slow.
>>> I am wondering if there is any tunning possible ?
>>>
>>>      
>> You'd have to pv-on-hvm drivers to get good IO performance.
>>    
> Where can I get them ?
>

What Fedora version are you using? What kernel? 

>> Other (easier) option is to use Fedora PV guest, instead of HVM.
>>
>>    
> Yeah I'm thinking about converting my image to PV but I was just  
> wondering why is so slow ...
> Note that fedora i386 do not look so slow on the same xen x64 host
>

Yeah that's weird.. 

Did you measure Xen cpu usage with "xm top" in dom0? 

What's using the CPU? 
Is there any load on dom0? Check with "top".

How did you measure the HVM guest is slow? 

-- Pasi


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users