Re: DMA problem (?) w/ 2.4.6-xfs and ServerWorks OSB4 Chipset

[Alan Cox]

> On an unrelated topic the Serverworks LE chipset does not seem to be capable 
> of handling 4GB of RAM, despite what the board vendors claim in their specs. 
> When a 4th 1G stick is added the system gets really slow --- like maybe 
> cacheing is disabled. We've seen this on both Tyan and SuperMicro boards. The 
> HE chipset seems to be ok.

Check the mtrr setups. I've seen slow machines that are slow with 4Gb purely
because the bios misconfigured the memory type ranges

Alan