[Xen-users] Re: Windows VM extremely slow

[Dennis Schridde <devurandom@xxxxxxx>]

On Thursday 02 June 2011 23:10:10 Dennis Schridde wrote:
> 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.
The other vm is a CentOS 5.6, config attached.

> > > 
> > > 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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