Fix for buildworld hang on XLR

[C. Jayachandran]

On Wed, Feb 10, 2010 at 1:23 PM, Neel Natu <neelnatu at gmail.com> wrote:
> On Tue, Feb 9, 2010 at 11:43 PM, C. Jayachandran
> <c.jayachandran at gmail.com> wrote:
>> Hi Randall,
>>
>> Looks like the buildworld hang was caused by a bug in the GMAC driver.
>> In some cases an additional zero length descriptor was getting added
>> to the descriptor list which makes the GMAC go into underrun
>> condition.  Can you see if this fix works for you?
>>
>> The patch is at http://sites.google.com/site/cjayachandran/files/rge.c.diff
>>
>> I still get a crash in pmap_enter during buildworld after quite a long
>> time. It seems that de-referencing the pte in some cases crashes. I'm
>> looking at it.
>>
>
> How much memory do you have installed on your system? Is any of that
> memory mapped above 512MB (physical)?

It is a 4GB memory system, and there is memory over 512MB.  I'm sill
new to this pmap subsystem, so will need some to understand this.

JC.