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Re: [Xen-users] PV FreeBSD and several CPU

To: admin@xxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] PV FreeBSD and several CPU
From: Dustin Marquess <dmarquess@xxxxxxxxx>
Date: Thu, 10 Jun 2010 10:43:04 -0500
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
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FreeBSD PV on a single CPU is unstable as it is.  SMP is completely
broken for the most part.

Right now the way to go w/ FreeBSD is to use the XENHVM kernel
configuration and run it inside a HVM.

The XENHVM kernel has disk & network PV drivers, so you won't suffer a
performance hit on those two.  The only hit would be CPU / memory (I
believe?) due to the HVM emulation.


On Wed, Jun 9, 2010 at 6:08 AM, masterito <admin@xxxxxxxxxxxxxxxx> wrote:
> Hello.
> I have xen 3.3.3 on CentOS 5.4
> I install PV FreeBSD on DomU for this HOW TO:
> http://forums.freebsd.org/showthread.php?t=10268
> When I create machine with 1 CPU (vcpus=1) - all work fine, bun when
> I  create machine with 4 CPU (vcpus=4) I see kernel panic on console:
> APIC: Using the MPTable enumerator.
> SMP: Added CPU 0 (BSP)
> SMP: Added CPU 1 (AP)
> SMP: Added CPU 2 (AP)
> SMP: Added CPU 3 (AP)
> gdtpfn=3df8cb pdptpfn=f63f4
> panic: HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu,
> &ctxt): /usr/src/sys/i386/xen/mp_machdep.c:929
> cpuid = 0
> KDB: enter: panic
> [thread pid 0 tid 0 ]
> Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
> db>
> Can somebody help me with resolv this problem?
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