On Tue, 12 Feb 2008, Roland Dreier wrote: > I don't know anything about the T3 internals, but it's not clear that > you could do this without a new chip design in general. Lot's of RDMA > devices were designed expecting that when a packet arrives, the HW can > look up the bus address for a given memory region/offset and place the > packet immediately. It seems like a major change to be able to > generate a "page fault" interrupt when a page isn't present, or even > just wait to scatter some data until the host finishes updating page > tables when the HW needs the translation.
Well if the VM wants to invalidate a page then the remote end first has to remove its mapping. If a page has been removed then the remote end would encounter a fault and then would have to wait for the local end to reestablish its mapping before proceeding. So the packet would only be generated when both ends are in sync. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
