Please stabilize the package above (in tree since Feb. 9th, it works, no open bugs against it). As you can see at the URL above the hpn patches in -r3 (hpn12-v19) have a bug which could lead to buffer_append_space errors (and I can confirm it). The new hpn patches in -r4 (hpn13-v1) do not have this error and they also promise further improved performance (see http://www.psc.edu/networking/projects/hpn-ssh/ for reference).
Steps to Reproduce:
No point in stabilizing anything until Bug 214985 is solved.
New HPN patch is also in 4.7_p1-r5. Marking closed.