On Tue, Oct 04 2005, Troy Benjegerdes wrote: > What we want is to be able to have the guest OS request some DMA > I/O operation, and have qemu be able to use AIO so that the actual disk > hardware can dump the data directly in the pages the userspace process > on the guest OS ends up wanting it in, avoiding several expensive memcopy > and context switch operations.
That should be easy enough to do already, with or without the nonblocking patch. Just make sure to open the files O_DIRECT and align the io buffers and lengths. With a 2.6 host, you can usually get away with 512-b aligment, on 2.4 you may have to ensure 1k/4k alignment. -- Jens Axboe _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
