Intel G41 graphics are slow while memory runs in dual channel mode.

Gary Jennejohn gljennjohn at
Fri Dec 17 19:36:09 UTC 2010

On Fri, 17 Dec 2010 18:42:10 +0100 (CET)
Oliver Fromme <olli at> wrote:

> Gary Jennejohn wrote:
>  > I doubt this has anything to do with dual-channel memory.  More likely
>  > is that you're trying to use 4GiB with i386, which can cause all kinds
>  > of problems.
>  > 
>  > You have two options, as fas as I can tell
>  > 1) run amd64, which can use the full 4GiB of memory
>  > 2) set hm.physmem to 3G (or maybe a little more) in /boot/loader.conf
> Are you sure that the second option has any effect?
> I also run i386 on two different boxes that have 4 GB RAM,
> and hw.physmem is set to 3.something automatically:
> olli at hexagon:~> sysctl hw.physmem; uname -rsm
> hw.physmem: 3474989056
> FreeBSD 8.1-STABLE-20100908 i386
> olli at atom:~> sysctl hw.physmem; uname -rsm
> hw.physmem: 3740434432
> FreeBSD 8.1-PRERELEASE-20100620 i386
> I haven't touched hw.physmem on these machines myself.
> Both boards have 2 x 2GB DIMMs.  The former is an ASUS
> M4A88TD-V EVO/USB3, the latter is an ASRock A330GC.

Well, maybe something has changed in the kernel since the last time I had
to do it.  I'm now using amd64 on all my machines, so I don't really have
to think about it anymore.

Gary Jennejohn

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