I'd go with 64-bit at 2GB and above. It's both faster and safer.
safer, how? (apart from no lowmem exhaust).
On a different subject, the qemu documentation says a guest VM can only
have 2Gb of memory - does this still apply when using a 64bit host O/S ?
The lowmem load is about 0.5% of guest memory, so 48GB means 240MB
lowmem allocated. Thin ice.
We currently only have about 12Gb used by the VM guests, so not hitting
that issue - the rest of HIGHMEM is host disk cache.
Our experience is that the bottle-neck on number of VM guests is disk
i/o - with loads of memory we've pretty much eliminated reads, so that
means disk writes.
Since you can run a 64-bit kernel with your existing userspace, at least
you have a simple upgrade path.
Not sure I like the idea of running a 64bit user space kernel on top of
a 32bit host, prefer to re-install.
Can I just replace my kernel with a 64bit one, or do I have to
re-install the host O/S ?
James
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