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vxge: prefetch RxD descriptors

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This patch prefetches RxD descriptors which helps to lower the latency of a
cache miss in vxge_hw_ring_rxd_next_completed.  This lowers the % of CPU
time used by vxge_hw_ring_rxd_next_completed() where the descriptor is
accessed in profiling netperf on a P4 Xeon from 1.5% to 1.0%.

Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin LaHaise 2009-08-04 10:21:39 +00:00 committed by David S. Miller
parent ff1b974cf3
commit 3f23e436d2
2 changed files with 2 additions and 0 deletions
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1
drivers/net/vxge/vxge-main.c
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@ -445,6 +445,7 @@ vxge_rx_1b_compl(struct __vxge_hw_ring *ringh, void *dtr,
vxge_hw_ring_replenish(ringh, 0);
do {
prefetch((char *)dtr + L1_CACHE_BYTES);
rx_priv = vxge_hw_ring_rxd_private_get(dtr);
skb = rx_priv->skb;
data_size = rx_priv->data_size;

1
drivers/net/vxge/vxge-traffic.c
View file

@ -731,6 +731,7 @@ vxge_hw_channel_dtr_try_complete(struct __vxge_hw_channel *channel, void **dtrh)
vxge_assert(channel->compl_index < channel->length);
*dtrh = channel->work_arr[channel->compl_index];
prefetch(*dtrh);
}
/*