Re: [Xen-users] Xen 3.0.0 32bit-pae (testing changeset 8270) crashes(pgtable.c:284, kernel bug?)

[Pavel Georgiev <pavel@xxxxxxxxxxxx>]

Is it possible to have > 3.5G available to DomU-s with xen 2? I`ve recently 
upgraded a server from 2 to 4 GB RAM and xen only sees 3455MB? 

On Thursday 02 February 2006 17:50, Matt Ayres wrote:
> Ian Pratt wrote:
> >> 3.0.1 seems to fix the bug I saw on my two machines, but now
> >> there is another
> >> (but somehow related) problem for me in 3.0.1-pae. I don't
> >> know if it's still
> >> related to the 3ware controller, but at least it only appears
> >> for domains
> >> that have memory above the 32bit adress-space again, so the
> >> first started
> >> domUs run fine. The big difference is that I don't have any
> >> complete freezes
> >> of the xen machine anymore, just domUs are crashing this time.
> >
> > Interesting. It looks like xen is running out of memory below 4GB, and
> > can't service the domain's request for a new L3 PGD, causing the domain
> > to bug out.
> >
> > Are you using dom0_mem= on the xen command line to constrain dom0's
> > memory usage or are relying on dom0 releasing memory automatically as
> > you start other domains? If the latter, I expect dom0 is hogging all the
> > pages below 4GB. [Grrr, PAE is such a crock...]
> >
> > Given that your 3ware controller is already putting pressure on the
> > bottom 4GB you'd be better off setting your initial dom0 memory at boot
> > time.
> >
> > Please let me know how you get on. BTW: can you get a serial line on the
> > machine? It might be interesting to see some of xen's memory usage
> > diagnostics.
>
> me me me!  Check my thread with Keir on xen-devel regarding this same
> issue.  I have full console access (with history logged!) and receive
> this same problem (PAE, 3ware, <4GB range).  I am now running 3.0-testing.
>
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