Re: [Xen-users] major slow down with xen implementation

["Todd Deshane" <deshantm@xxxxxxxxx>]

On Thu, Sep 25, 2008 at 11:57 AM, Geoffrey <lists@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Grant McWilliams wrote:
>
>> Wouldn't you have to do make -j 4 to use 4 cores?  It looks like on the
>> laptop you're using one 2.5 Ghz core and on the Xen VM you're using one
>> 2.66
>> Ghz core.
>
> Thank you, that has made a huge difference.  Still, I'm concerned with the
> results now:
>
> laptop (make -j 3) (2 cores)
>
> real    0m16.70s
> user    0m26.82s
> sys     0m5.50s
>
> virtual server with 4 cores (make -j 5) (4 cores)
>
> real    0m22.36s
> user    0m26.24s
> sys     0m54.97s
>
>
> Is this a reasonable expectation with virtualization?
>

This doesn't seem quite right to me, try kernbench and
also make sure the versions of xen and guest kernels
are the same on the server and laptop for a good
comparision.

The overhead of Xen PV should be pretty low vs native.

Todd

> --
> Until later, Geoffrey
>
> Those who would give up essential Liberty, to purchase a little
> temporary Safety, deserve neither Liberty nor Safety.
>  - Benjamin Franklin
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>



-- 
Todd Deshane
http://todddeshane.net
check out our book: http://runningxen.com

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