E4500 with 24GB RAM

Kris Kennaway kris at obsecurity.org
Fri Jun 10 21:12:41 GMT 2005

On Sat, Jun 11, 2005 at 12:44:35AM +0900, Hiroki Sato wrote:
> Doug White <dwhite at gumbysoft.com> wrote
>   in <20050606132756.X16994 at carver.gumbysoft.com>:
> dw> Since the panic is in a KASSERT thats why it only pops up under
> dw> INVARIANTS.  However the bus_dma tags specify that hme can only handle 32
> dw> bit addresses so it should be using a bounce buffer. I'm guessing that
> dw> bus_dma needs to be taught about this limitation and use bounce buffers
> dw> for the IOMMU on >16GB systems.
> dw> 
> dw> Someone should also research this value a bit more ... I wonder if its
> dw> from some older system (E450?), and newer machines have larger limits. I
> dw> would hope they'd build E4500s with IOMMUs that can address all of
> dw> physical memory.
>  Hmmm, I notice the box sometimes hangs up with <16GB RAM under
>  moderate network load just after "hme0: invalid packet size
>  xxxx; dropping" is displayed.  I tried 16, 12, 8, and 4GB.
>  Another E4500 with 5GB RAM seems OK, though.

I wonder if it's disk related.  I tried to check out a ports tree on
this machine and it hung in a few seconds (although this was also
checking out using the network via nfs).


>  Is there anyone interested in investigating?  I can provide remote
>  access (serial console available) to this box.
> -- 
> | Hiroki SATO

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