> >But try to reduce Linux guest size and make sure there is no > >need to page out your Linux guest. >Avoid overcommitting memory in VM. This is the old question of >who should do the paging, VM or the guest operating system. In >case of Linux as the guest OS, Linux should do the paging. >Why? Because only Linux can free memory instead of paging.
If the answer were so trivial this would not be "the old question" ;-) When possible you probably would even want to prevent paging in Linux, so make all your Linux images large enough in that they never need to page and have room for big buffer cache as well. And make the VM system large enough to hold the total sum of storage for all virtual machines without paging. Tuning can be easy ;-) So, Martin, how long does a jump take before you're on the ground with both feet again ;-)
