How to debug >2GB memory issues (and 3ware)

Claus Guttesen cguttesen at
Wed Nov 24 07:51:14 GMT 2004

> > I have a Dual 4GB system with a 3ware SATA
> > controller that's working
> > properly as long as I restrict it to 2GB with:
> >    hw.physmem=2G
> > 
> Short term fix:
>    Remove the last Gig of RAM so that there was only
> 3 GB physical RAM in the box. Note that limiting it
> to 3GB with hw.physmem=3G
>    did NOT work, that only worked to 2 GB.
> Long term fix:
>    Replace the 8 512MB Corsair DIMMs (where are
> approved to run with the Arima motherboard) with 4
> Kingston 1GB DIMMs. All problems vanished
> immediately and the box runs fine with 4 Gig.

Hmm, funny. I just bougth an Tyan GX28 with 4 GB RAM
and a 3ware-sata-controller. Installed FreeBSD 5.3
(amd64), works like a charm. Luckily (as it turns out)
the salesman and I agreed on 4 x 1GB memory modules
(long term fix).


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