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    DateTue, 26 Apr 2005 07:12:36 +0100
    FromChristoph Hellwig <>
    SubjectRe: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
    On Mon, Apr 25, 2005 at 05:02:36PM -0700, Roland Dreier wrote:
    > The idea is that applications manage the lifetime of pinned memory
    > regions.  They can do things like post multiple I/O operations without
    > any page-walking overhead, or pass a buffer descriptor to a remote
    > host who will send data at some indeterminate time in the future.  In
    > addition, InfiniBand has the notion of atomic operations, so a cluster
    > application may be using some memory region to implement a global lock.
    > 
    > This might not be the most kernel-friendly design but it is pretty
    > deeply ingrained in the design of RDMA transports like InfiniBand and
    > iWARP (RDMA over IP).
    
    Actuallky, no it isn't.   All these transports would work just fine with
    the mmap a character device to hand out memory from the kernel approach
    I told you to use multiple times and Andrew mentioned in this thread aswell.
    What doesn't work with that design are the braindead designed by comittee
    APIs in the RDMA world - but I don't think we should care about them too
    much.
    
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