Re: [uml-devel] buggy UML AMD64?

[Daniel Gryniewicz <dang@gentoo.org>]

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On Fri, 2007-01-19 at 16:14 +0000, Antoine Martin wrote:
> Daniel Gryniewicz wrote:
> > I'm the gentoo usermode-sources maintainer, and I run UML almost
> > exclusively on amd64.  I have, at any given time, from 4 to 20 UMLs
> > running on my main dev box, most of them 32-bit, and I haven't had any
> > stability problems.
> Can you send me more details of your setup as I am quite experienced 
> with UML and now completely stuck with AMD64.
> 
> > Is your RAM OK?
> Oh yes, this has nothing to do with the hardware.
> 
> > Which kernels do you have inside and outside?
> Host (outside):
> 2.6.19.2-skas3-v8.2

Okay, that's one big difference.  I have a stock kernel (well,
gentoo-sources) on the outside, not a SKAS3 patched kernel.  Maybe that
makes a difference on amd64?

> Inside: pick any of those (none of them work with >=2.6.16):
> http://uml.nagafix.co.uk/
> 
> >  How are
> > you trying to build the 32-bit UMLs?
> These are the same as on the site above (which I maintain) and these 
> have worked flawlessly for a long long time.
> 
> I have downgraded the x86 boxes to 2.6.15.7 and these are up and running 
> again. But I can't do that for all of them, and this is just not an 
> option for some of the amd64 boxes.

My setup is:

Host boxes:
	- Dual dual-core opteron 265 with 6GB of RAM running 2.6.17-gentoo-r8
	- Turion laptop with 2GB of RAM running currently 2.6.20-rc5 (stock)
but most recently 2.6.19-ck1 (stock).
	- Athlon64 3000+ with 1GB of RAM running ck-sources-2.6.19_p2-r3
Notice, no UML related patches on the host boxes.

UML Boxes:
	- usermode-sources-2.6.16-r6 (2.6.16 with genpatches 15 and -bs2)
	- usermode-sources-2.6.18-r1 (2.6.18 with genpatches 8 and -bb2)
	- Modified usermode-sources-2.6.14-r6 (2.6.14 with -bs3 and networking
patches for work) (this one also runs on 32-bit hosts running various
gentoo kernels on workstations at work)

All of these run some form of Gentoo inside; not necessarily recent.
Each of them runs in both 32 and 64 bit versions. I have also briefly
run a UML with a fedora core 2 image, running a usermode-sources-2.6.18
kernel, on the opteron box, but that was only very briefly.  That's a
32-bit only UML.

Daniel

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