[PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun

[Roland Dreier]

    Roland> Testing on PCI Express/Arbel systems (with dual 3.2 GHz
    Roland> Xeons) with FW 4.5.3, I've seen somewhat different
    Roland> behavior.  Even after setting IPOIB_NUM_WC to 1 so that
    Roland> IPoIB never polls more than 1 CQE at a time (and so we
    Roland> always inc the CI by exactly 1), I still get the CQ
    Roland> overrun.

FW 4.6.1 on these systems behaves the way Tavor FW 3.3.1 did on my
systems: if I modify IPoIB to always poll 1 CQE at a time, it works
fine.  If IPoIB polls more than 1 CQE at a time then we see an
overrun.

 - Roland