linux-kernel - Re: 2.6.32-rc3: low mem - only 378MB on x86

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Date:	Mon, 05 Oct 2009 16:31:47 -0400
From:	Valdis.Kletnieks@...edu
To:	Tomasz Chmielewski <mangoo@...g.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why?

On Mon, 05 Oct 2009 21:42:09 +0200, Tomasz Chmielewski said:
> > Heh.  You've really squeezed yourself into a bad situation.  Go get a
> > 64-bit kernel... please.  You should be able to run 32-bit userspace
> > with a 64-bit kernel.  Do you have some 32-bit kernel component that you
> > are relying on?
> 
> Note that in such setups (64 bit kernels and 32 bit userspace) *some* 
> software will not work correctly (perhaps it's limited to tightly 
> kernel-userspace integrated software).
> 
> One example is open-iscsi - you won't run 32 bit open-iscsi userspace on 
> a 64 bit kernel (at least it was impossible a couple of months ago).

Sounds like somebody blew it on 32/64 bit combatability on a syscall,
most likely a parameter to an ioctl?

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