Re: [Xen-users] User-time vs system-time in DomU

[Randy Thelen <rthelen@xxxxxxxxxx>]

Lamia M.Youseff wrote:

> I have a question about Xen performance that I did not find  
> answered anywhere. I am using /usr/bin/time tool to track the  
> performance of my application, which reports on user time, sys  
> time, real time as well as CPU %.
> I noticed that my application finishes in almost the same real time  
> for DomU as in native kernel. However, I got almost double the user  
> time, sys time and the cpu%.
> It is important to me to understand why the time is doubled. What  
> does user time, Real time and sys time refer to in DomU?
> Thank you for your reply in advance,
> Lamia Youseff
>
> Xen3-2.6.12
> 55.07usr 3.03sys 2:07.94real 45%CPU
>
> Linux-2.6.12
> 37.30usr 1.30sys 2:06.95real 30%CPU
Have you run with Xiaowei Yang's patch from yesterday:

http://lists.xensource.com/archives/html/xen-devel/2006-03/msg01051.html

It fixes some user time issues.  I'd like to know if this patch fixes  
the problem you're seeing.
-- Randy

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