In dpaa2_io_store_next(), if the current dequeue entry is not the last, prefetch the next one as most likely it will be requested shortly by the consumer driver.
This brings a ~3% improvement for dpaa2 ethernet driver IP forwarding with small size frames. Signed-off-by: Ioana Radulescu <[email protected]> --- drivers/soc/fsl/dpio/dpio-service.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c index 5583d28..56a35c0 100644 --- a/drivers/soc/fsl/dpio/dpio-service.c +++ b/drivers/soc/fsl/dpio/dpio-service.c @@ -613,6 +613,7 @@ struct dpaa2_dq *dpaa2_io_store_next(struct dpaa2_io_store *s, int *is_last) if (!(dpaa2_dq_flags(ret) & DPAA2_DQ_STAT_VALIDFRAME)) ret = NULL; } else { + prefetch(&s->vaddr[s->idx]); *is_last = 0; } -- 2.7.4
