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Benefits & Facts: - Messages up to 2 kilobytes may be sent. - Both parties may use non-disjoint user buffers. E.g. any userspace address. - Userspace buffers can page fault. - Page faults punish timeslice of only the faulting thread. - Any number of extended ipcs can take place at any one time, since only ktcbs of ipc parties are engaged. No global buffer is used. - This also provides smp-safety benefit. Disadvantages: - There is triple copying penalty. This has to be done: - Sender buffer to sender ktcb - Sender ktcb to receiver ktcb - Receiver ktcb to receiver buffer. This is due to the fact that buffers can be on non-disjoint userspace addresses. If you want to avoid disadvantages and lose some of the benefits, (e.g. address freedom, shorter copy size) use FULL IPC.