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xen-users
[Xen-users] Re: Windows VM extremely slow
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:
1) Please CC me, because I am not on the list.
2) The slowness starts when I connect via VNC. Before that the status is "--
b---" instead of "------", and it changes to the latter immediately.
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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