[Pkg-xen-devel] Xend not starting (Lenny backport of Xen 3.4.3-rc3)

[Ian Campbell]

On Thu, 2010-04-01 at 23:49 +0800, Thomas Goirand wrote:
> Thomas Goirand wrote:
> > Just a bit of feedback now: I've been running Xen 3.4.2 on my laptop for
> > few days now (without xend, but still under Xen), and I have a very
> > snappy feeling: my desktop seems to run as fast as when running without
> > Xen, which was not at all the case last November when running 3.3.1 and
> > the pv_ops dom0 patch of the time.
> 
> Another feedback, negative this time.

Thanks for your feedback. For this sort of issue it would be more useful
to raise on xen-devel. As you observe others are having similar problems
with X so adding your experiences to that thread on xen-devel would be
useful.

> After I set my dom0 to use 2048 MB of RAM, I get only 1113 MB of free
> RAM. It as if a part of the RAM (829 MB of RAM) has gone! Quite wacko
> isn't it? Could it be that the memory management is broken somehow? I'll
> try to dig further.

I've seen something similar and have a suspicion this might be related
to the e820 map -- I think RAM which coincides with reserved regions in
your e820 is currently handed back to the hypervisor. Again this would
be worth raising on xen-devel. I vaguely recall a patch recently to
reclaim this RAM somehow.

I was planning to experiment with dom0_mem=<X>G on the hypervisor
command line plus mem=<X+1>G on the kernel command line and see if I
could balloon dom0 backup to get the full <X>G I asked for.

Ian.

-- 
Ian Campbell
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