[nycbug-talk] memory and cpu question on a new setip

Brian A. Seklecki lavalamp at spiritual-machines.org
Thu Mar 29 17:08:15 EDT 2007

Some drivers are incompatible with PAE; i think the module framework 
doesn't work with PAE alltogether.

How about an amd64 kernel?


On Thu, 29 Mar 2007, alex at pilosoft.com wrote:

> On Thu, 29 Mar 2007, Jonathan Vanasco wrote:
>> ( sorry for being clueless this week.  new server arrived. )
>> 1) Memory
>> 	I just tossed in 2gb of ram into a server , for a total of 4
>> 	Bios sees it all
>> 	The kernel gives me this message on boot (does not go in /var/log/
>> messages):
>> 		720896K of memory above 4GB ignored
>> 	and this message on boot (does go into /var/log/messages )
>> 		Mar 29 16:19:36 crookedrain kernel: real memory  = 3479298048 (3318
>> MB)
>> 		Mar 29 16:19:36 crookedrain kernel: avail memory = 3404574720 (3246
>> MB)
>> 	top shows around 3200 on the system as well.
>> 	Where could my memory have gone?
>> 	All the research i've done says that I should be find for memory
>> under 4gb, and that I'd only need to use pae if i'm using 4+gb
> There are things like "PCI bounce areas", or areas used for AGP buffers.
> You can generally get to 3.5G by changing video memory/AGP aperture.
> Occasionally, if you are lucky, you can get 3.7G.
> However, to get full 4G, I would suggest x64 kernel. I'm not sure if PAE
> will fix the "PCI reserved areas" issue.
>> 2) CPU
>> 	i'm running a xeon 3040 'dual core'
>> 	i'm just using the standard kernel.
>> 	i get this in dmesg
>> 		FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>> 		cpu0 (BSP): APIC ID:  0
>> 		cpu1 (AP): APIC ID:  1
>> 	i tried using the SMP kernel on a whim, but it wouldn't boot.  can
>> someone confirm that should be the case?
> Uh, that message says SMP *did* work. It detected two CPUs.
>> 	it makes sense to me that the SMP shouldn't work- i treated this as
>> a single cpu from the outset ,  considering 2 cores to still be a
>> single cpu.
> No, two cores for all purposes means two CPUs.
> Why do you say "wouldn't boot"? What was the error?
>> 	but the dmesg makes me second guess that.
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 	-lava (Brian A. Seklecki - Pittsburgh, PA, USA)

"...from back in the heady days when "helpdesk" meant nothing, "diskquota"
meant everything, and lives could be bought and sold for a couple of pages
of laser printout - and frequently were."

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