From 34e4179df65d72d83e71860b099d71e0f3aa1210 Mon Sep 17 00:00:00 2001 From: willy tarreau Date: Thu, 16 Jan 2014 08:20:15 +0100 Subject: [PATCH] net: mvneta: prefetch next rx descriptor instead of current one Currently, the mvneta driver tries to prefetch the current Rx descriptor during read. Tests have shown that prefetching the next one instead increases general performance by about 1% on HTTP traffic. Cc: Thomas Petazzoni Cc: Gregory CLEMENT Tested-by: Arnaud Ebalard Signed-off-by: Willy Tarreau Signed-off-by: David S. Miller --- drivers/net/ethernet/marvell/mvneta.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index aa3a4f7..c7b37e0 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -611,6 +611,7 @@ mvneta_rxq_next_desc_get(struct mvneta_rx_queue *rxq) int rx_desc = rxq->next_desc_to_proc; rxq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(rxq, rx_desc); + prefetch(rxq->descs + rxq->next_desc_to_proc); return rxq->descs + rx_desc; } @@ -1442,7 +1443,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, u32 rx_status; int rx_bytes, err; - prefetch(rx_desc); rx_done++; rx_filled++; rx_status = rx_desc->status; -- 2.7.4