Re: aac & PAE not happy in -current

On Mar 21, 2007, at 12:36 AM, Scott Long wrote:

> Kevin Day wrote:
>> I've got a Dell PowerEdge 2650 running the 200702 -current  
>> snapshot. It's fine with 2GB of ram, but when I tried bumping it  
>> to 6GB and turning on PAE, the aac driver panics on boot.
>> aacch0: <AAC RAID Channel> port 0xcc00-0xccff mem  
>> 0xfccff000-0xfccfffff irq 30 at device 6.0 on pci5
>> aacch1: <AAC RAID Channel> port 0xc800-0xc8ff mem  
>> 0xfccfe000-0xfccfefff irq 31 at device 6.1 on pci5
>> aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device  
>> 8.1 on pci4
>> panic: pmap_mapdev: Couldn't alloc kernel virtual memory
>
> The device is asking for 128MB of register space.  This is exhausting
> the limit on the amount of kernel mapped memory, hence the panic.  The
> difference between PAE and non-PAE is likely that the non-PAE case
> isn't consuming as much kernel address space for the extra page  
> tables,
> so you're squeaking by.
>
> The 128MB of register space is wrong, but it's something that the aac
> firmware is causing.  I don't have a 2650, but my 2450 only tries to
> claim 4K for registers for the aac device, and the hardware is  
> basically
> identical to the 2650.  Maybe try flashing in a newer (or older)
> firmware?  Knowing what firmware version you have would help.


I thought it was a bit odd that it wanted a 128MB window as well.  
This controller DOES have a 128MB battery backed dimm in it, but I  
can't imagine why it would need to expose that to the host.

aac0: i960RX 100MHz, 118MB cache memory, optional battery present

118MB of cache, plus a register window rounds up to 128MB?  Maybe  
just a coincidence though.


It says it's using firmware "2.7-1 [Build 3170]". It appears that  
they're up to 2.8.1 as the latest firmware now, I'll give it a try to  
upgrade it on my next trip to the datacenter. Nothing in their  
changelog seems to indicate any changes that might affect this, but  
I'll give it a shot.

I can tell you that a quick scan of all of our systems, all 14 Dells  
we have that contain a 3/Di, they're all requesting 128MB of memory  
space.

aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 16 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 7 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
... etc

And we bought them all at random times, so they all probably have  
different firmware versions.