[Xen-users] xm info/xm list mismatch (and negative memory)

[Jeff Bachtel <jeff@xxxxxxxxxxx>]

I am seeing a mismatch between memory reported by xm list and xm info.
xm info's total_memory and free_memory are negative, while xm list's
value for dom0 is the total amount of free RAM on the box
(4GB-overhead).

I'm not particularly concerned about the negative values reported,
however I can only start a domU allocated less than 128M of RAM (I've
confirmed 124M works), which is less than ideal. It is apparently a
hugely negative info['scrub_memory'] values which is causing this
(xend/XendNode.py line 75). Unfortunately, correcting the value in
that python script does not affect whether I am able to start a domU
with more memory. Perhaps an insufficiently large type for
scrub_memory, somewhere, causing a rollover to negative?

Is this problem known in 3.0.2? Does anyone have a suggested solution?

System package information (more available on request):

Linux vpr-app-00 2.6.16.21-0.25-xenpae #1 SMP Tue Sep 19 07:26:15 UTC
2006 i686 i686 i386 GNU/Linux

xen-tools-ioemu-3.0.2_09763-0.8
kernel-xenpae-2.6.16.21-0.25
xen-doc-html-3.0.2_09763-0.8
xen-doc-pdf-3.0.2_09763-0.8
xen-tools-3.0.2_09763-0.8
xen-3.0.2_09763-0.8
xen-libs-3.0.2_09763-0.8

xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0     3909     1 r-----   127.0

xm info
host                   : vpr-app-00
release                : 2.6.16.21-0.25-xenpae
version                : #1 SMP Tue Sep 19 07:26:15 UTC 2006
machine                : i686
nr_cpus                : 8
nr_nodes               : 1
sockets_per_node       : 2
cores_per_socket       : 2
threads_per_core       : 2
cpu_mhz                : 2793
hw_caps                : 00000000:00000180:0000649d:00000000:00000001
total_memory           : 4095
free_memory            : -4998
max_free_memory        : -1154
max_para_memory        : 0
max_hvm_memory         : 0
xen_major              : 3
xen_minor              : 0
xen_extra              : .2_09749-0.7
xen_caps               : xen-3.0-x86_32p
platform_params        : virt_start=0xf5800000
xen_changeset          : 09749
cc_compiler            : gcc version 4.1.0 (SUSE Linux)
cc_compile_by          : abuild
cc_compile_domain      : suse.de
cc_compile_date        : Thu Jul 20 03:19:42 UTC 2006

Thanks,

-- 
Jeff Bachtel  (root@VPR,TAMU)     http://www.cepheid.org/~jeff
"The sciences, each straining in  [finger jeff@xxxxxxxxxxx for PGP key]
its own direction, have hitherto harmed us little;" - HPL, TCoC

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