Messages in this thread | | | Date | Thu, 13 Apr 2006 13:16:41 +0200 (CEST) | From | Oliver Weihe <> | Subject | Re: Re: Opteron 128GB NODMAPSIZE too small? |
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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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