[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] address mapping between domains
> > With sane DMA-capable hardware the driver domain never > needs to actually > > map the page into its address space anyhow. However, the grant table > > stuff will still be required to enable us to configure the IO MMU > > appropriately to allow the DMA (we expect to see such h/w > support become > > commonplace). > > True for some kinds of IO. Network IO needs sorting through > packets, so no direct DMA will be done. The headers of network packets are sent out-of-band so that mapping of the main payload is only required if you have some very fancy iptables rules that do deep inspection. I don't believe there's a significant overhead to the protection provided by grant tables, and they go some way to keeping the security folks happy. Anyhow, we can benchmark it in a couple of days... Ian ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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