[Xen-users] Re: Windows VM extremely slow

[Dennis Schridde <devurandom@xxxxxxx>]

On Thursday 02 June 2011 23:06:10 Dennis Schridde wrote:
> On Thursday 02 June 2011 22:51:31 Dennis Schridde wrote:
> > I have a Windows VM which behaves extremely slow. In VNC it takes tens of
> > seconds for a mouse movement to be reflected by the cursor and a click or
> > keypress takes minutes to have an effect. A connection via RDP is not
> > possible at all, because it is impossible to connect to the host.
> > 
> > I do not think I have enabled any limitations on cpu consumption for this
> > vm, nor do I have another explanation for the slowness. Another vm (also
> > hvm) is working normally.
> > 
> > Does anyone have an idea why the machine could be so slow?
> > 
> > xm top displays the machine like this:
> >       NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k)
> >       MAXMEM(%)
> > 
> > VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
> > 
> >        XXX ------         21    0.3    1056640   11.2    1064960     
> >        11.3
> > 
> > 1    1      677       13    2        0    27908     3096    0
> > 
> > I have the config of this vm attached.
> 
> P.S: I forgot a few things:
P.P.S: Some corrections to my text to prevent misunderstandings:

> 1) Please CC me, because I am not on the list.
> 2) The slowness starts when I connect via VNC.
The slowness builds up quickly after connecting via VNC. First the mouse 
cursor moves jumpily, then after a few seconds it doesnt move at all anymore.

2.1) Before that the status is "-- b---" instead of "------", and it changes
to the latter shortly after connecting.

> 3) The used cpu percentage is at 10-20 percent until I connect via VNC,
> then it drops to below 1, i.e. 0.X.
> 4) VBD_RD is always counting up, right from the very start. There is no
> influence of a VNC connection to this parameter.
> 5) I am using CentOS 5.6 with xen 3.1.2-238.9.1.el5 and kernel
> 2.6.18-238.9.1.el5xen.
> 
> --Dennis

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