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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 <thomas.petazzoni@free-electrons.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
willy tarreau 2014-01-16 08:20:15 +01:00 committed by David S. Miller
parent 5428213c04
commit 34e4179df6
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/marvell/mvneta.c
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@ -611,6 +611,7 @@ mvneta_rxq_next_desc_get(struct mvneta_rx_queue *rxq)
int rx_desc = rxq->next_desc_to_proc; int rx_desc = rxq->next_desc_to_proc;
rxq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(rxq, rx_desc); 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; return rxq->descs + rx_desc;
} }
@ -1442,7 +1443,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
u32 rx_status; u32 rx_status;
int rx_bytes, err; int rx_bytes, err;
prefetch(rx_desc);
rx_done++; rx_done++;
rx_filled++; rx_filled++;
rx_status = rx_desc->status; rx_status = rx_desc->status;