Re: poor performance on big machine

[Freddie Cash <fjwcash+dfly@xxxxxxxxx>]

On July 30, 2007 09:23 am Freddie Cash wrote:
> On July 30, 2007 08:34 am Francois Tigeot wrote:
> > On Mon, Jul 30, 2007 at 04:58:46PM +0200, Simon 'corecode' Schubert
>
> wrote:
> > > Matthew Dillon wrote:
> > > >    Is the machine swapping?  Look at the SWAP PAGER stats with
> > > > systat -vm 1.
> > >
> > > I did not configure a swap partition, if that's sufficient
> > > information. The box has 4GB RAM (which seem not to be completely
> > > usable, the kernel writes at bootup something like 512MB above 4GB
> > > ignored).
> >
> > Some devices need to be mapped to the first 4GB of address space. You
> > will need a 64-bit kernel to be able to use all your memory...
>
> Depends on the CPU and chipset on the motherboard.
>
> We've had great success using AMD Opterons and AMD 8100-series
> chipsets, using the software and hardware re-mapping settings in the
> BIOS to map the PCI bus/device memory regions above the 4 GB boundary. 
> BIOS count of RAM shows 5120 MB on systems with 4 GB of physical RAM. 
> Kernel shows 4 GB of usable memory space.

Forgot to mention the above is using 32-bit FreeBSD 6.x and 32-bit Debian 
Linux 4.0 installs.

-- 
Freddie Cash, LPIC-2 CCNT CCLP      Network Support Technician
School District 73                  (250) 377-HELP [377-4357]
fjwcash+dfly@gmail.com