Re: Re: Opteron 128GB NODMAPSIZE too small?

[Oliver Weihe]

Dear Andi,

thx for your quick reply.

> > While running SuSE Linux 10.0 (x86_64) with a vanilla 2.6.16.1 on an
> > 8way (8 sockets) Opteron equipped with 128GB (16GB per socket) of
> > memory
> > I found this in dmesg.
> > 
> > Any guesses to which value I should set NODEMAPSIZE?
> > Currently it is 0xfff (from 'include/asm-x86_64/mmzone.h')
> 
> 0x2fff. Or update to a newer kernel - it should
> have that problem fixed by finding a better hash shift that works
> with a smaller table too.

A newer Kernel (vanilla 2.6.16.5) doens't solve the problem (hash-shift
is still 25bit and with the default 12bit (0xfff) in NODEMAPSIZE there
is still one bit missing to adress the whole memory).
Anyway, increasing NODEMAPSIZE solves the problem. I wanted to ask you
before doing this because I'm not familar with the code and can't imagin
if this has any sideeffects.

Regards,
  Oliver Weihe

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