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[Xen-devel] mapped memory delay?

I ran into the following problem:

I setup a shared ring page and an event channel between two domains (dom0
and one domU), DomU increases req_prod by one and notify the dom0 via the
event channel, dom0 then check req_prod pointer and process the request in
the shared ring. But I noticed that sometimes dom0 get the irq triggered
by the notification event, but the req_prod remains the same. This
situation only happened occasionally. Why? Because the req_prod is saved
in the shared, mapped page, I suspect that there is a delay of updates
between two domains. Is that true? If so, how to handle this problem?

Your advice is highly appreciated!


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