Prefmem of bus 3

Li-Ta Lo ollie at
Mon Mar 1 13:38:00 CET 2004

On Mon, 2004-03-01 at 11:48, Eric W. Biederman wrote:
> ron minnich <rminnich at> writes:
> > On Fri, 27 Feb 2004, YhLu wrote:
> > 
> > > Have you ever tested myrinet card on K8 MB under LinuxBIOS?
> > 
> > we have a 1408-node K8 machine with myrinet working under linuxbios, and a 
> > 256-node K8 machine working with linuxbios. Arima HDAMA mainboards.
> > 
> > I wonder what's going on here, I have not had time to look in detail.
> So the problem appears to be that the prefmem region on the upper bus
> is to large.
> I wonder if why this work on LANL clusters and not on others is the
> result of code skew.
> Lightning nodes with myrinet only seem to have one prefmem region.
> Yet another reminder that I really need to finish syncing up the code bases.

I think there is some problem in the resource allocation code so it can 
not handle devices with 2 prefmem.

Is the code just picking the "largest" resource ? I am really confused
by the code in devices.c


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