[Xen-users] Extra Probes on xl create

[Ian <murrayie@xxxxxxxxxxx>]

Hi All,

I have two Xen machines, both running 4.12 compiled from source. One is 
running SL6.2 with a kernel compiled from vanilla source (3.2.0) and the 
second is using the stock kernel from Ubuntu (3.2.0-23-generic).
I moved a pv CentOS 5.8 vm from the SL machine to the Ubuntu machine and 
noticed a difference when starting (i.e. an error)
"xl -v create" gives...


SL 6.2

domainbuilder: detail: xc_dom_allocate: cmdline="ro root=LABEL=/ 
console=xvc0 ", features="(null)"
domainbuilder: detail: xc_dom_kernel_mem: called
domainbuilder: detail: xc_dom_malloc            : 10836 kB
domainbuilder: detail: xc_dom_do_gunzip: unzip ok, 0x21bbf4 -> 0xa952d8
domainbuilder: detail: xc_dom_ramdisk_mem: called
domainbuilder: detail: xc_dom_boot_xen_init: ver 4.1, caps 
xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p 
hvm-3.0-x86_64
domainbuilder: detail: xc_dom_parse_image: called
domainbuilder: detail: xc_dom_find_loader: trying ELF-generic loader ...
domainbuilder: detail: loader probe OK

Ubuntu 12.04

domainbuilder: detail: xc_dom_allocate: cmdline="ro root=LABEL=/ 
console=xvc0 ", features="(null)"
domainbuilder: detail: xc_dom_kernel_mem: called
domainbuilder: detail: xc_dom_malloc            : 10836 kB
domainbuilder: detail: xc_dom_do_gunzip: unzip ok, 0x21bbf4 -> 0xa952d8
domainbuilder: detail: xc_dom_ramdisk_mem: called
domainbuilder: detail: xc_dom_boot_xen_init: ver 4.1, caps 
xen-3.0-x86_64 xen-3.0-x86_32p
domainbuilder: detail: xc_dom_parse_image: called
domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary 
loader ...
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying Linux bzImage loader ...
xc: error: panic: xc_dom_bzimageloader.c:556: 
xc_dom_probe_bzimage_kernel: kernel is not a bzImage: Invalid kernel
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying ELF-generic loader ...
domainbuilder: detail: loader probe OK


Both boot fine, and it looks like the Ubuntu version is trying to do 
something extra. I googled the error message and I am not concerned 
about it as it appears to be a spurious error caused by an extra probe.
Apart from the SL vs Ubuntu difference, I thought I had the machines 
pretty similar from a Xen perspective. Can anyone please explain why 
these extra probes are talking place and what in my (possibly build) 
environment might have caused this to happen (or indeed cause this *not* 
to happen on the SL box).
Thanks in advance,

Ian.


xl info for Ubuntu:

host                   : xen4
release                : 3.2.0-23-generic
version                : #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 2
threads_per_core       : 2
cpu_mhz                : 1800
hw_caps                : 
bfebfbff:20100800:00000000:00000940:0040e31d:00000000:00000001:00000000
virt_caps              :
total_memory           : 4078
free_memory            : 1155
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .2
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : placeholder
cc_compiler            : gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
cc_compile_by          : root
cc_compile_domain      :
cc_compile_date        : Mon May 21 00:50:17 BST 2012
xend_config_format     : 4

xl info for SL:

host                   : xen3
release                : 3.2.0+
version                : #3 SMP Sat Jan 21 12:27:48 GMT 2012
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2300
hw_caps                : 
178bf3ff:efd3fbff:00000000:00001310:00802001:00000000:000007ff:00000000
virt_caps              : hvm
total_memory           : 8159
free_memory            : 4878
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .2
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : loglvl=all guesloglvl=all
cc_compiler            : gcc version 4.4.5 20110214 (Red Hat 4.4.5-6) (GCC)
cc_compile_by          : root
cc_compile_domain      : (none)
cc_compile_date        : Sun Jan 22 01:18:42 GMT 2012
xend_config_format     : 4




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