On Thu, Dec 8, 2016 at 3:10 AM, Bart Van Assche <bart.vanassche@xxxxxxxxxxx> wrote: > The DMA mapping operations are in the hot path so it is important that the > overhead of these operations is as low as possible. There has been a reason > in the past to have DMA mapping operations that are specific to the IB > subsystem but that reason no longer exists today. can you elaborate on that a little further... I recall it was something with the ipath and Co drivers and memory extensions on 32 bit systems? > An additional benefit is that the size of HW and SW > drivers that do not use DMA is reduced by switching to dma_noop_ops. few words on that? -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
