Re: [Xen-devel] Credit scheduler

[pak333@xxxxxxxxxxx]

I have 4 physical cpus (2 dual core sockets) and the IO workload is loadsim 
with 500 users

Thanks
-Prabha


 -------------- Original message ----------------------
From: Keir Fraser <keir@xxxxxxxxxxxxx>
> How many physical CPUs do you have, and what is the IO workload that one of
> the VMs is running?
> 
>  -- Keir
> 
> On 26/6/07 22:33, "pak333@xxxxxxxxxxx" <pak333@xxxxxxxxxxx> wrote:
> 
> > Hi
> >  
> > I have noticed that VMs are typically spending 3 microsecs or less before 
> > they
> > are being prempted. I thought that the credit schduler time slice was 30 
> > ms. I
> > have 4 VMs running and they are all cpu intensive except for 1 (which is IO
> > intensive) but having a VM spend max 3 micro secs before being kicked out
> > seems strange.
> >  
> > Is there something else going on that i am not aware of. Is the time slice
> > really 30 millisecs? I am using default parameters of the credit scheduler.
> >  
> > Thanks
> > -Prabha
> >  
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 
>

--- Begin Message ---

• To: <pak333@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
• From: Keir Fraser <keir@xxxxxxxxxxxxx>
• Date: Wed, 27 Jun 2007 00:59:38 +0000

How many physical CPUs do you have, and what is the IO workload that one of the VMs is running?  

 -- Keir

On 26/6/07 22:33, "pak333@xxxxxxxxxxx" <pak333@xxxxxxxxxxx> wrote:

Hi
 
I have noticed that VMs are typically spending 3 microsecs or less before they are being prempted. I thought that the credit schduler time slice was 30 ms. I have 4 VMs running and they are all cpu intensive except for 1 (which is IO intensive) but having a VM spend max 3 micro secs before being kicked out seems strange.
 
Is there something else going on that i am not aware of. Is the time slice really 30 millisecs? I am using default parameters of the credit scheduler.
 
Thanks
-Prabha
 

---

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