[Xen-devel] Re: xen-unstable domU smp broken for vcpus > physical cpus

[Rik van Riel <riel@xxxxxxxxxx>]

On Fri, 1 Apr 2005, Ryan Harper wrote:

> Rik mentioned in #xen on irc.oftc.net that his smp domU was crashing.
> Mine was working and we started to investigate.  Turns out that using
> xen-unstable from 2005-04-01 when domU is launched with vcpus > physical
> cpus, domU, and in my case, Xen itself crash.  Attached is the debug log
> of Xen going down.

Interesting, I haven't made Xen itself crash.  Here are the
config options that may be relevant:

CONFIG_XEN=y
CONFIG_ARCH_XEN=y
CONFIG_NO_IDLE_HZ=y

#
# XEN
#
# CONFIG_XEN_PRIVILEGED_GUEST is not set
# CONFIG_XEN_PHYSDEV_ACCESS is not set
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
# CONFIG_XEN_NETDEV_FRONTEND_PIPELINED_TRANSMITTER is not set
# CONFIG_XEN_BLKDEV_TAP is not set
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_X86=y
# CONFIG_X86_64 is not set
CONFIG_HAVE_ARCH_DEV_ALLOC_SKB=y


-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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