On Thu, Jun 11, 2009 at 02:13:17PM -0400, Hany Fahim wrote:
> My apologies. Here it is:
> Xen 3.3:
>
> [root@node1 ~]# xm info
> total_memory : 3063
> free_memory : 128
> node_to_cpu : node0:0-1
> node_to_memory : node0:128
> xen_major : 3
> xen_minor : 3
> xen_extra : .1
>
> Xen 3.0.3:
>
> [root@node2 ~]# xm info
> total_memory : 2046
> free_memory : 256
> node_to_cpu : node0:0
> xen_major : 3
> xen_minor : 1
> xen_extra : .2-128.1.6.el5
This shows that the Hypervisor is giving correct info back with both
versions. So the problem must be at the libvirt space, and I believe
I know what the problem is.
The version of Xen in RHEL5 has
struct xen_sysctl_availheap {
/* IN variables. */
uint32_t min_bitwidth; /* Smallest address width (zero if don't care). */
uint32_t max_bitwidth; /* Largest address width (zero if don't care). */
int32_t node; /* NUMA node of interest (-1 for all nodes). */
/* OUT variables. */
uint64_t avail_bytes; /* Bytes available in the specified region. */
};
While upstream Xen has
struct xen_sysctl_availheap {
/* IN variables. */
uint32_t min_bitwidth; /* Smallest address width (zero if don't care). */
uint32_t max_bitwidth; /* Largest address width (zero if don't care). */
int32_t node; /* NUMA node of interest (-1 for all nodes). */
/* OUT variables. */
uint64_aligned_t avail_bytes;/* Bytes available in the specified region. */
};
Notice the 'avail_bytes' field is now aligned, so its 4 bytes further
down from where libvirt is expecting it to be.
We'll have to provide a fix in libvirt to use the new alignment for
newer Xen.
Regards,
Daniel
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