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Re: [Xen-devel] memory size inside domU less than memory in domU config
| To: | Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] memory size inside domU less than memory in domU config |
| From: | Vasiliy G Tolstov <v.tolstov@xxxxxxxxx> |
| Date: | Mon, 20 Jun 2011 18:55:04 +0400 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Mon, 20 Jun 2011 07:55:50 -0700 |
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On Mon, 2011-06-20 at 10:36 -0400, Konrad Rzeszutek Wilk wrote: > So I tried the same experiment - a physical machine with 'mem=1G' provided > and an PV guest with 'mem=1G'. The same exact kernel in both cases and got: > > Machine with 'mem=1G' on the command line. > [ 0.000000] Memory: 1022756k/1048576k available (5851k kernel code, 452k > absent, 25368k reserved, 2881k data, 688k init) > > PV guest: > [ 0.000000] Memory: 1018888k/1048576k available (5851k kernel code, 448k > absent, 29240k reserved, 2881k data, 688k init) > > So a DomU guest "eats" an extra 4MB compared to running it under baremetal. > (Note, the DomU guest has no balloon space in this example). > > The memblock=debug does provide the info of what the "other" reserved regions > are > and it looks to be the matter of just going through the numbers to figure out > what > it is. > Can You provide pv kernel cmdline and config file ? -- Vasiliy G Tolstov <v.tolstov@xxxxxxxxx> Selfip.Ru _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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