Re: Credit scheduler

[Keir Fraser <keir@xensource.com>]

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Are these all Windows HVM guests? And do you exclude domain0 when you count
the number of VMs in your system (so it¹s actually 4 user VMs + domain0 VM)?
How did you come up with the 3us figure ‹ some kind of in-guest tracing, or
using xentrace, or by some other means?

Does the problem still happen if you run 2 cpu-intensive VMs instead of 3?

 -- Keir

On 27/6/07 02:09, "pak333@comcast.net" <pak333@comcast.net> wrote:

> 
> 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@xensource.com>
>> > 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@comcast.net" <pak333@comcast.net> 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@lists.xensource.com
>>> > > http://lists.xensource.com/xen-devel
>> > 
>> > 
> 
> 
> 
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> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



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