Hi all,
I am configuring a Xen host with 4-5 guest VMs and have a question about
allocation of memory for buffer and cache. As I understand it, all guest
disk IO is routed through dom0 first. Does this mean that dom0
buffer/cache is used for guest I/O as well, and guest buffer/cache is
redundant?
I have seen at least one commercial xen VPS vendor disabling buffer and
cache for guests. Is this simply a tradeoff for memory vs performance,
or is there really no benefit to having two levels of buffers and cache?
-Taj.
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