Strange latency hvm domU boot xen 4.0.1-rc2-pre and 2.6.32.15 pv_ops

[Fantu <fantonifabio@tiscali.it>]

Dom0:
pvops 2.6.32.15 (last commit of xen/stable2.6.32.x)
xen 4.0 hg-testing (changeset 21188)
13 windows pv guest (all xp pro sp3 with gplpv 0.11.0.213), disk with
tap2:aio
dom0 RAM fixed to 1GB and balloning off

we noticed a very impressive speed starting up the first 6-7 windows domU.
after this very high loading speed, starting the remaining domains always
lead to
an gradual performance loss.
activity on phisical disk seems to be less and less) and the remaining
domains
are loaded at very low speed respect to the former.
after a relative long time (2-6 minutes) and some of the latest domains were
loaded
and started, the remaining 1-2 domains seems to load at normal (high) speed
again.

is no problem of start specific domU
before update kernel and xen to last commit the problem was more

save, restore and shutdown of all 13 domU are very fast, problem is only on
start...already reapeat all test some times

no logs in syslog nor in kernel.log neither in xend.log are printed out,
even with
maximum level of verbosity.

any help appreciated here
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