more RAM + faster disk -> slower box?!

Paul Richards paul at freebsd-services.com
Thu Nov 29 18:40:37 GMT 2001


--On Thursday, November 29, 2001 18:32:17 +0000 Sam Smith <S at mSmith.net>
wrote:
> 
> My mail consisted of a reference to:
> http://www.cs.utk.edu/~labstaff/cluster/pdf/440BXAGPset.pdf (the
> relevant chipset AFAICT)
> 
> 
> and the words
> " Note that the DRAM controller will only talk to 512 unless you
> have "registered DIMMs"  "
> 

Ahh, I didn't read the reference but that makes a whole lot more sense.

Plugging in more than 512M of memory was overloading the physical
parameters of the memory bus, registered memory would allow the loading to
go higher.

It doesn't directly explain the FreeBSD behaviour that followed and it has
nothing whatsoever to do with cacheing.

Paul Richards
FreeBSD Services Ltd
http://www.freebsd-services.com




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