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

[Matt Ayres <matta@xxxxxxxxxxxx>]

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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