net: skb_shared_info optimization
skb_dma_unmap() is quite expensive for small packets,
because we use two different cache lines from skb_shared_info.
One to access nr_frags, one to access dma_maps[0]
Instead of dma_maps being an array of MAX_SKB_FRAGS + 1 elements,
let dma_head alone in a new dma_head field, close to nr_frags,
to reduce cache lines misses.
Tested on my dev machine (bnx2 & tg3 adapters), nice speedup !
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 6eb7f37..9c897cf 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1300,7 +1300,7 @@
buffer_info->length = size;
WARN_ON(buffer_info->dma != 0);
buffer_info->time_stamp = jiffies;
- buffer_info->dma = map[0] + offset;
+ buffer_info->dma = skb_shinfo(skb)->dma_head + offset;
pci_map_single(adapter->pdev,
skb->data + offset,
size,
@@ -1340,7 +1340,7 @@
buffer_info->length = size;
buffer_info->time_stamp = jiffies;
- buffer_info->dma = map[f + 1] + offset;
+ buffer_info->dma = map[f] + offset;
buffer_info->next_to_watch = 0;
len -= size;