PAE causing system crashes

[Michael Barnett]

To ammend this slightly..  When running the PAE kernel, they will  
stay online indefinitely under little to no load.  It is only when i  
want them to actually work will they freak out and reboot.

-m

On Jan 17, 2006, at 1:47 PM, Michael Barnett wrote:

> I have 3 dell machines with 2x xeon procs, 8G of ram, and a half  
> terabyte raid 5.  I attempted to run the AMD64 distribution on  
> these boxes which was fine for everything except mysql, (which is  
> all these boxes are going to do) so I reinstalled 5.4 i386.
>
> uname -a  looks like (hostname obscured):
>
> FreeBSD myhost.mydomain.com 5.4-RELEASE-p9 FreeBSD 5.4-RELEASE-p9  
> #2: Mon Jan 16 23:27:12 PST 2006     root at myhost.mydomain.com:/usr/ 
> obj/usr/src/sys/SMP-PAE  i386
>
>
> My problem is, if i don't enable PAE in the kernel, i can only  
> address half the ram in the boxes, but... the machines are stable.
>
> If i do enable PAE, i can address all the memory, but they randomly  
> reboot without dumping any errors or logging.
>
> To enable PAE, i am building and booting off the following kernel  
> config:
>
> <snip>
> include PAE
>
> ident           SMP-PAE
>
> options         SMP
> options         KVA_PAGES=512
> </snip>
>
> I added the KVA_PAGES options hoping to stabilize the machine  
> (doesn't seem to have made any difference.)  The only other tuning  
> i am doing at the moment is in loader.conf:
>
> <snip>
> kern.maxdsiz="2147483648"                # Set the max data size
> </snip>
>
> When i boot without PAE I use the generic SMP kernel, and the  
> machine is stable.
>
> I know that there are a number of other kernel tunables i could be  
> tweaking, but I am not really sure where to start as the machine  
> dies silently.  I was hoping that someone who has run a stable PAE  
> kernel with 8G of ram + could point me in the right direction.
>
> Thanks,
>
> -Michael
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