On Wed, 2008-06-04 at 21:13 -0700, Roland Dreier wrote: > > Increase IPoIB ring sizes to twice the original size to act as > > a shock observer for high traffic picks. First let me correct myself, absorber and not observer.
> > Looks fine but I would like to include a little more motivation in the > changelog. What type of workload benefits from this change? So this is what I suggest for the changelog: Increase IPoIB ring sizes to twice the original size to act as a shock absorber for high traffic picks. With the current settings, we have seen cases that there are many calls to netif_stop_queue()/netif_wake_queue(). This causes degradation in throughput. Also larger receive buffer sizes help IPoIB in CM mode to avoid experiencing RNR NAK conditions due to insufficient receive buffers at the SRQ. This increase is still modest compared to other Ethernet drivers -- bnx2 uses 256 for it HW queue length (on 4K page size machines). _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
