From: Oliver Weihe <o.weihe@deltacomputer.de>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Re: Opteron 128GB NODMAPSIZE too small?
Date: Thu, 13 Apr 2006 13:16:41 +0200 (CEST) [thread overview]
Message-ID: <1624893.1144927001987.SLOX.WebMail.wwwrun@exchange.deltacomputer.de> (raw)
In-Reply-To: <200604121946.59895.ak@suse.de>
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
prev parent reply other threads:[~2006-04-13 11:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-12 17:33 Oliver Weihe
2006-04-12 17:46 ` Andi Kleen
2006-04-13 11:16 ` Oliver Weihe [this message]
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