From: Sowmini Varadhan <sowmini.varadhan@xxxxxxxxxx> Date: Tue, 31 Mar 2015 21:08:18 -0400 > I'm starting to wonder if some approximation of dma premapped > buffers may be needed. Doing a map/unmap on each packet is expensive. It's much more amortized with smart buffering strategies, which are common on current generation networking cards. There you only eat one map/unmap per "PAGE_SIZE / rx_pkt_size". Maybe the infiniband stuff is doing things very suboptimally, and actually with that subsystem and drivers absolutely nothing would surprise me. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
