--- a/ocaml/xapi/vmops.ml
+++ b/ocaml/xapi/vmops.ml
@@ -296,7 +296,7 @@
 let vcpu_configuration snapshot = 
   let vcpus = Int64.to_int snapshot.API.vM_VCPUs_max in
   let vcpus_current = Int64.to_int snapshot.API.vM_VCPUs_at_startup in
-  let pcpus = with_xc (fun xc -> (Xc.physinfo xc).Xc.max_nr_cpus) in
+  let pcpus = 256 in (* with_xc (fun xc -> (Xc.physinfo xc).Xc.max_nr_cpus) in *)
   debug "xen reports max %d pCPUs" pcpus;
 
   (* vcpu <-> pcpu affinity settings are stored here. Format is either:
