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| author | David S. Miller <davem@davemloft.net> | 2015-05-12 10:39:27 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-12 10:39:27 -0400 |
| commit | 8df2914598c5300a937760daa271fdbddce1108c (patch) | |
| tree | 1b67a0aa202e867b950b6ac2062df7faaa5c1d23 /drivers/net/ethernet/intel/igb/igb_main.c | |
| parent | b396cca6fafccf16206a5d041d59c9e6b65b6f5a (diff) | |
| parent | e51423d9959df283c5af4ff13703f87e39d6e144 (diff) | |
Merge branch 'netdev_page_frags'
Alexander Duyck says:
====================
Refactor netdev page frags and move them into mm/
This patch series addresses several things.
First I found an issue in the performance of the pfmemalloc check from
build_skb. To work around it I have provided a cached copy of pfmemalloc
to be used in __netdev_alloc_skb and __napi_alloc_skb.
Second I moved the page fragment allocation logic into the mm tree and
added functionality for freeing page fragments. I had to fix igb before I
could do this as it was using a reference to NETDEV_FRAG_PAGE_MAX_SIZE
incorrectly.
Finally I went through and replaced all of the duplicate code that was
calling put_page and replaced it with calls to skb_free_frag.
With these changes in place a simple receive and drop test increased from a
packet rate of 8.9Mpps to 9.8Mpps. The gains breakdown as follows:
8.9Mpps Before 9.8Mpps After
------------------------ ------------------------
7.8% put_compound_page 9.1% __free_page_frag
3.9% skb_free_head
1.1% put_page
4.9% build_skb 3.8% __napi_alloc_skb
2.5% __alloc_rx_skb
1.9% __napi_alloc_skb
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/intel/igb/igb_main.c')
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_main.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index e63664649029..8a45ed7506c5 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -4974,6 +4974,7 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, struct igb_tx_buffer *first; int tso; u32 tx_flags = 0; + unsigned short f; u16 count = TXD_USE_COUNT(skb_headlen(skb)); __be16 protocol = vlan_get_protocol(skb); u8 hdr_len = 0; @@ -4984,14 +4985,8 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, * + 1 desc for context descriptor, * otherwise try next time */ - if (NETDEV_FRAG_PAGE_MAX_SIZE > IGB_MAX_DATA_PER_TXD) { - unsigned short f; - - for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) - count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size); - } else { - count += skb_shinfo(skb)->nr_frags; - } + for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) + count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size); if (igb_maybe_stop_tx(tx_ring, count + 3)) { /* this is a hard error */ |