I know many of the people here are very busy and these might be questions that are not about your work at hand, but these intricacies of libibverbs are hard to figure out without an intimate knowledge of the drivers (from the user side). I would really appreciate anyone who would take the time to respond.
On Thu, Apr 1, 2010 at 10:09 AM, Matthew Small <matthewtsm...@gmail.com> wrote: > I am trying to understand the behavior of the libibverbs after it has been > set into fork safe mode via a successful call to ibv_fork_init() or setting > the environmental variable IBV_FORK_SAFE. For my purposes I would like to > know the following : > > Are PDs, QPs and CQs created before a fork shared by the parent and child > after fork() has returned (ie. both can submit WRs, poll CQ, etc.)? > > > What about MRs registered before the fork? Even though the child doesn't > have access to the parent's memory, can he sill submit WRs on a QP with an > MR created before the fork? > > > What if the MR pages in the above scenario are accessible in both parent and > child (shared memory)? Are there complications with registering shared > memory? > > > In general, are pointers returned by libibverbs pointer to user/process > address space (as ibv_mr pointers must be) or kernel space (eg. if an > unrelated process had another process's QP pointer, lkey, and a virtual > address could it post (almost certainly unsafely) a WR to the other > process's QP? > > > Sorry if the questions seem progressively more goofy and thanks in advance > for any clarification. > > -Matt > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
