You probably want to leave it at 128Mb for your domU's but try not to starve
dom0 (1/2 gig should be fine). I suspect the main factor here will be the
file system cache - dom0 does the dirty work on behalf of the domU's so one
would think that the larger the cache the better. I'm not sure what's
involved in tuning this though (nor whether any is required).
On 11/1/06, Cormac McClean <cormac.mcclean at gmail.com> wrote:
>> Thanks to all who emails with assitance regarding setting up Xen on the
> DELL PowerEdge 2850. I got it working with Debian Etch/Sid and the
> packages xen-linux-system-2.6.18-1-xen-686 and xen-hypervisor-3.0.3-1-i386
>> I have one further question relating to the allocation of RAM to the
> domU's. I have 3.5 GBs of RAM (potentially 4GB but I don't want to risk
> messing up a working setup to recompile the kernel for the extra 0.5GB)
> and I have 20 domUs (possibly asking for trouble, but I want each
> student to have his/her own virtual server). I have allocated 128MB to
> each of the domU's, leaving 1109MB for dom0 (of which currently 261 is
> used and 847 free with the 20 domU's running). Should I allocate more to
> dom0? I could reduce the RAM for the domU's to 64MB each, which would
> effectively double the RAM for dom0, but is this a waste? How important
> is RAM to dom0?
>> Any advice on this would be appreciated.
> Cormac McClean.
> Lecturer, Athlone IT Software Engineering
> Free/Open Source Software Enthusiast
>> Please avoid sending me Microsoft Word or PowerPoint attachments.
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