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RE: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2 LPs

To: "Alex Williamson" <alex.williamson@xxxxxx>
Subject: RE: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2 LPs
From: "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
Date: Wed, 21 Jun 2006 10:04:39 +0800
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Thread-topic: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2 LPs
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.
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?
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. 
Thanks & Best Regards

OTC,Intel Corporation

> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@xxxxxx]
> Sent: 2006年6月21日 7:41
> To: Zhang, Xiantao
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-ia64-devel] [PATCH]Enable xen0 smp when machine only has2
> LPs
> On Tue, 2006-06-20 at 18:02 +0800, Zhang, Xiantao wrote:
> > This patch intends to enable xen0's smp when machine only has 2 LPs.
> > Thanks & Best Regards
> Xiantao,
>    For such a simply change, this patch caused me a lot of trouble.
> When I repeatedly reboot domU, I can get it into a state reported as
> "------" by xm list.  The domU console appears hung.  I can always get
> it out of this state by running xenctx on the domain.  At that point the
> console wakes up again and I get a software watchdog oops in the domU.
> The backtrace in the oops is a standard cpu_idle kind of patch.  My HVM
> capable systems sometimes even failed to boot dom0 when I applied this
> patch.  Thanks,
>       Alex
> --
> Alex Williamson                             HP Open Source & Linux Org.

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