Re: Xen on NetBSD 6.0_BETA DOM0 crashes

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Feb 20, 2012 at 09:51:24PM +0000, Ian Clark wrote:
> Hi All,
> 
> I've recently got a new bulldozer CPU (see all my other recent woes!),
> which is now running just wonderfully with NetBSD 6.0_BETA, so I
> thought I'd give Xen a go.
> 
> Unfortunatly it seems quite crashy.
> 
> Xen is built with the following kernel config, although the generic
> DOM0 is no better:-
> 
> http://188.222.86.41/~ian/xen/salome_XEN0.txt
> 
> Booting from a bootloader from around 5.99.62ish, using the following:
> 
> load /netbsd.xen3 root=wd0a console=pc;multiboot
> /usr/pkg/xen41-kernel/xen.gz dom0_mem=12G

Hum, 12G. A bug invoving large memory has just been fixed.
Please try a very recent -HEAD kernel (netbsd-6 has not been fixed yet),
you need
src/sys/arch/x86/x86/pmap.c 1.170
src/sys/arch/xen/x86/x86_xpmap.c 1.40

> 
> Machine is a 6 core AMD FX-6100 (6 core bulldozer, family 0x15), AMD
> 880G mobo, 16 gig of memory.
> 
> It will boot and stay up fine under light load, but anything heavy
> will bring it down to it's knees, usually after only a few minutes. (A
> compile of a kernel is enough.)
> 
> When booting I get a lot of:-
> 
> pmap_kenter_pa: mapping already present

This was harmless, and newer kernels don't have this message any more.

> 
> and over time dmesg fills up with:
> 
> evtchn_do_event: handler 0xffffffff8021a38f didn't lower ipl 8 7

This is annoying but harmless.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--