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Subject[PATCH net-next 0/9] intel: switch to napi_build_skb()
Date
napi_build_skb() I introduced earlier this year ([0]) aims
to decrease MM pressure and the overhead from in-place
kmem_cache_alloc() on each Rx entry processing by decaching
skbuff_heads from NAPI per-cpu cache filled prior to that by
napi_consume_skb() (so it is sort of a direct shortcut for
free -> mm -> alloc cycle).
Currently, no in-tree drivers use it. Switch all Intel Ethernet
drivers to it to get slight-to-medium perf boosts depending on
the frame size.

ice driver, 50 Gbps link, pktgen + XDP_PASS (local in) sample:

frame_size/nthreads 64/42 128/20 256/8 512/4 1024/2 1532/1

net-next (Kpps) 46062 34654 18248 9830 5343 2714
series 47438 34708 18330 9875 5435 2777
increase 2.9% 0.15% 0.45% 0.46% 1.72% 2.32%

Additionally, e1000's been switched to napi_consume_skb() as it's
safe and works fine there, and there's no point in napi_build_skb()
without paired NAPI cache feeding point.

[0] https://lore.kernel.org/all/20210213141021.87840-1-alobakin@pm.me

Alexander Lobakin (9):
e1000: switch to napi_consume_skb()
e1000: switch to napi_build_skb()
i40e: switch to napi_build_skb()
iavf: switch to napi_build_skb()
ice: switch to napi_build_skb()
igb: switch to napi_build_skb()
igc: switch to napi_build_skb()
ixgbe: switch to napi_build_skb()
ixgbevf: switch to napi_build_skb()

drivers/net/ethernet/intel/e1000/e1000_main.c | 14 ++++++++------
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 +-
drivers/net/ethernet/intel/iavf/iavf_txrx.c | 2 +-
drivers/net/ethernet/intel/ice/ice_txrx.c | 2 +-
drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
drivers/net/ethernet/intel/igc/igc_main.c | 2 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 2 +-
8 files changed, 15 insertions(+), 13 deletions(-)

--
2.33.1

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