4.11-STABLE/PAE

[Jeremy Bogan]

Hiya,

We've recently loaded FreeBSD 4.11-STABLE with PAE support onto one of  
our brand new Dell PowerEdge 2650's. The box has 6GB RAM and with PAE  
support compiled into our kernel can see it all fine. However when we  
start doing disk intensive stuff like compiling, our RAID appears to  
spack out and cause the system to freeze and require a reboot. When  
logging in via console we see:

aac0: COMMAND TIMEOUT AFTER 1540 SECONDS

repeated continuously.

Apr  5 22:10:24 luke1 /kernel: CPU: Intel(R) Xeon(TM) CPU 3.06GHz  
(3050.63-MHz 686-class CPU)
Apr  5 22:10:24 luke1 /kernel: Origin = "GenuineIntel"  Id = 0xf29   
Stepping = 9
Apr  5 22:10:24 luke1 /kernel:  
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE 
,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Apr  5 22:10:24 luke1 /kernel: Hyperthreading: 2 logical CPUs
Apr  5 22:10:24 luke1 /kernel: real memory  = 6442450944 (6291456K  
bytes)
Apr  5 22:10:24 luke1 /kernel: avail memory = 6000644096 (5860004K  
bytes)

When disabling PAE support everything appears to be perfectly fine, but  
we're only able to address 4GB out of our 6GB. Just wondering if anyone  
else has experienced this or has any insight.

The system is running RAID5 with 4 x 73GB SCSI drives:

Apr  5 22:30:03 luke1 /kernel: aac0: <Dell PERC 3/Di> mem  
0xf0000000-0xf7ffffff irq 16 at device 8.1 on pci4
Apr  5 22:30:03 luke1 /kernel: aac0: i960RX 100MHz, 118MB cache memory,  
optional battery present
Apr  5 22:30:03 luke1 /kernel: aac0: Kernel 2.8-0, Build 6092, S/N  
64a1d3
Apr  5 22:30:03 luke1 /kernel: aac0: Supported  
Options=275c<WCACHE,DATA64,HOSTTIME,WINDOW4GB,SOFTERR,NORECOND,SGMAP64>

Thanks :)

-- 
jeremy bogan    [ jeremy at segpub.com.au ]
segment publishing - design.develop.host