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RE: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2LPs

To: "Alex Williamson" <alex.williamson@xxxxxx>
Subject: RE: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2LPs
From: "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
Date: Wed, 21 Jun 2006 11:37:40 +0800
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Thread-topic: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2LPs
Very strange! Seems it is related to different platforms. Maybe potential bugs 
invoked these troubles in smp environment. :)  I will retry to produce them and 
wish to get it. Thanks.

OTC,Intel Corporation

> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@xxxxxx]
> Sent: 2006年6月21日 11:11
> To: Zhang, Xiantao
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2LPs
> On Wed, 2006-06-21 at 10:04 +0800, Zhang, Xiantao wrote:
> > Hi Alex,
> >     I couldn't reproduce your troubles here with this change. Could you
> > check with "xm vcpu-list" to see the time of vcpus?  I also found xenU
> > state "-----", but I think it should be normal, because LPs were
> > occupied by xen0 at that time. Only if time of vcpus is increasing,
> > domU should be alive.
> Hi Xiantao,
>    The vcpu time on my domU was not increasing.  The watchdog oops in
> the domU when kicking it with xenctx also indicates that domU was
> getting no time.  FWIW, I saw this on a zx6000, madison system (2-way
> box).  I was booting a UP dom0 w/ 2GB of memory, and a UP domU w/ 1GB of
> memory.  DomU is configured with 1 vnif, and only booted to single user
> mode.  I usually saw the domU hang within about 5 reboots.
> > I am also confused that CONFIG_NR_CPUS was set to 16 in xenU's
> > configuration file(linux-defconfig_xenU_ia64), Why not come across
> > those troubles before?
>    Nobody tests the -xenU kernel on a regular basis anymore.  I
> typically only test the -xen kernel.
> > Maybe we should come out a better solution for this issue. Anyway it
> > is a must to set CONFIG_NR_CPUS to >4 for xen0 and XenU when LPs >4.
>    I agree, and I can't explain why such a seemingly simple change
> triggered this problem.  Thanks,
>       Alex
> --
> Alex Williamson                             HP Open Source & Linux Org.

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