Re: [Xen-devel] Restoring an HVM domain with PV drivers fails if VCPUs >= 4.

[Yoshisato YANAGISAWA <yanagisawa.yoshisato@xxxxxxxxxxxxx>]

Thank you for your reply,

As you mentioned, I tried PV drivers in latest xen-3.3-testing.hg, and 
it works well.  I increased the number of VCPUs from 4 to 9 and it still 
works.
Thank you,
Yoshisato YANAGISAWA.

On 2008/12/03 18:10, Keir Fraser wrote:
> Hi,
>
> This is probably a livelock in the PV drivers, now fixed. Please try
> building your PV drivers from latest xen-3.3-testing.hg repository (that is,
> 3.3.1-rc1).
>
>  -- Keir
>
> On 03/12/2008 05:21, "Yoshisato YANAGISAWA"
> <yanagisawa.yoshisato@xxxxxxxxxxxxx> wrote:
>
> > Hi,
> >
> > Does anybody who has an experience to save and restore an HVM domain
> > with VCPUs >= 4 and PV drivers?
> >
> > I tried save and restore an HVM domain that has 4 VCPUs with PV drivers
> > enabled, and failed to restore.  Restored domain did not respond to any
> > inputs including virtual console, VNC, network I/O (through ssh, ping)
> > and so on.  According to the result of xentop, I saw 400% CPU usage of
> > the restored domain.
> >
> > This problem did not happen if an HVM domain has less than or equals to
> > 3 VCPUs.  This problem also did not happen if an HVM domain without PV
> > drivers.  Because of the situation, I suppose there might be some bugs
> > in PV drivers.
> >
> > I am using i386 Dom0 on Xen 3.3.0, and PV drivers are installed from
> > source code included in Xen 3.3.0.
> >
> > Do you have any ideas to attack this problem?
> >
> > Thank you in advance,
> > Yoshisato YANAGISAWA.

--
Yoshisato YANAGISAWA, Ph.D.
Open Source Software Computing Project
NTT Cyber Space Laboratories
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
1-1 Hikarinooka, Yokosuka-Shi,
Kanagawa 239-0847, Japan

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