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Re: [Xen-devel] hypervisor memory usage


good that you pointed to 5.2 vs 5.3 vs 5.4,
the difference in number of pages is noticed between these:

      xen.gz-2.6.18-92.1.22.el5  - last 5.2 update - all pages are ok,
xen.gz-2.6.18-128.el5 - first 5.3 release - ~80000 pages missing on 8GB ram setup.

Chris Lalancette wrote:
Vladimir Zidar wrote:
Sounds possible. However it would be great if there was switch to disable that feature in case hardware is not capable of VT-d, as I'd rather use those 300mb than have software support for something that I can't actually use.

In point of fact, VT-d is disabled by default; you need to explicitly enable it
for it to use memory.  However, it's possible that there's a bug, or some other
change caused the memory difference, so it's worthwhile to try and track it down
a little better.  In particular, you jumped from the 5.2 kernel to the 5.4, so
it would be worthwhile to try the 5.3 kernel and see what you get.

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