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xen-devel
[Xen-devel] Does Xen force all AIO be synchronous?
Hi,
I have these questions for a while. As AIO can help improve better
performance and Linux kernel keeps tunning the AIO path, more and more IOs
can be expected to take AIO path instead of regular I/O path.
First Question:
If we consider Xen, do we need to do AIO both in the domain0 and guest
domains at the same? For example, considering two situations, let a full
virtualized guest domain still do regular I/O and domain0 (vbd back end
driver) do AIO; or let both full-virtualized guest domain and domain0 do
AIO. What is possible performance difference here?
Second Question:
Does Domain0 always wait till AIO data is available and then notify guest
domain? or Domain0 will issue an interrupt immediately to notify guest
domain0 when AIO is queued? If the first case is true, then all AIOs will
become synchronous.
Third Question:
Does Xen hypervisor change the behavior of Linux I/O scheduler more or less?
Four Question:
Will AIO have different performance impact on para-virtualized domain and
full-virtualized domain respectively?
Thanks,
Liang
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