DragonFly kernel List (threaded) for 2007-07
Re: poor performance on big machine
On July 30, 2007 08:34 am Francois Tigeot wrote:
> On Mon, Jul 30, 2007 at 04:58:46PM +0200, Simon 'corecode' Schubert
> > 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.
Freddie Cash, LPIC-2 CCNT CCLP Network Support Technician
School District 73 (250) 377-HELP [377-4357]