Re: [Xen-devel] VMX status report. Xen:25334 & Dom0:568b445...

["Ren, Yongjie" <yongjie.ren@xxxxxxxxx>]

> -----Original Message-----
> From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> Sent: Tuesday, May 22, 2012 4:32 PM
> To: Ren, Yongjie
> Cc: Konrad Rzeszutek Wilk; Wu, GabrielX; Liu, SongtaoX; Zhou, Chao;
> 'xen-devel@xxxxxxxxxxxxx'
> Subject: Re: [Xen-devel] VMX status report. Xen:25334 & Dom0:568b445...
> 
> On Tue, 2012-05-22 at 08:19 +0100, Ren, Yongjie wrote:
> > > -----Original Message-----
> > > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> > > Sent: Monday, May 21, 2012 10:22 PM
> > > To: Wu, GabrielX
> > > Cc: 'xen-devel@xxxxxxxxxxxxx'; Ren, Yongjie; Liu, SongtaoX; Zhou, Chao
> > > Subject: Re: [Xen-devel] VMX status report. Xen:25334 &
> Dom0:568b445...
> > >
> > > On Mon, May 21, 2012 at 03:05:28AM +0000, Wu, GabrielX wrote:
> > > > Hi all,
> > > >
> > > > This is the test report of xen-unstable tree.
> > > > There are two issues found and one issue got fixed.
> > > >
> > > > Version Info:
> > > >
> > >
> ============================================================
> > > =====
> > > > xen-changeset:   25334:f8279258e3c9
> > > > Dom0:          linux.git  3.4.0-rc7+ (commit: 568b445...)
> > > >
> > >
> ============================================================
> > > =====
> > > >
> > > > New issues(2)
> > > > ==============
> > > > 1. long stop during the guest boot process with qcow image
> > > >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1821
> > > > 2. vcpu-set doesn't take effect on guest
> > > >   http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1822
> > >
> > > Does it work if you (in the guest) do
> > > echo 1 > /sys/../cpu9/online ?
> > >
> > The problem is there's no hot-add vCPU in /sys/devices/system/cpu
> directory.
> > e.g. I start a guest with 2 vCPU,
> 
> Do you mean with maxvcpu=4 vcpus=2 in your config?
> 
> >  then I run command 'xl vcpu-set $domID 4'.
> 
> >     There are only 2 CPUs(cpu0 and cpu1) listed in
> /sys/devices/system/cpu directory.
> 
> The bugzilla says "But it'll effect to dom0.", does this mean that
>       xl vcpu-set domU 4
> will actually set dom0 to 12 vcpus? Or does it just mean that
>       xl vcpu-set 0 4
> works where
>       xl vcpu-set domU 4
> does not?
> 
'xl vcpu-set 0 4' works well for dom0 in some circumstances.
'xl vcpu-set domU 4' doesn't work for dumU at all.

'xl vcpu-set' for dom0 also has a bug. 
You can use 'xl vcpu-set' command to decrease vCPU number for dom0;
but when you try to increase its number you might meet dom0 panic.
Please look at my comment #2 in the following BZ.
http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1730

> There's quite a bit of potentially useful info missing from the bug
> report, like guest config details, xenstore content etc,
> http://wiki.xen.org/wiki/Reporting_Bugs_against_Xen has a list of
> various log files which are often useful to help solve bugs, please do
> consider including those which seem relevant on future bug reports.
> 
Thanks for your advice. We'll pay more attention to this.

-Jay

> Ian.
> 
> >
> > > There is a race in the generic hotplug code.
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
> 

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