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| author | Edward Cree <ecree@solarflare.com> | 2019-08-06 14:53:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-08 18:22:29 -0700 |
| commit | 5e040d4b1a440b832c7b4cf8116eebcdff91909c (patch) | |
| tree | d6bd9e10898bcc52262ddee53532d76aef742ad9 /drivers/net/ethernet/sfc | |
| parent | 5e6d9fc76190aa70db9cbfb18a6f44f4ee83b7f5 (diff) | |
| download | linux-stable-5e040d4b1a440b832c7b4cf8116eebcdff91909c.tar.gz linux-stable-5e040d4b1a440b832c7b4cf8116eebcdff91909c.tar.bz2 linux-stable-5e040d4b1a440b832c7b4cf8116eebcdff91909c.zip | |
sfc: don't score irq moderation points for GRO
We already scored points when handling the RX event, no-one else does this,
and looking at the history it appears this was originally meant to only
score on merges, not on GRO_NORMAL. Moreover, it gets in the way of
changing GRO to not immediately pass GRO_NORMAL skbs to the stack.
Performance testing with four TCP streams received on a single CPU (where
throughput was line rate of 9.4Gbps in all tests) showed a 13.7% reduction
in RX CPU usage (n=6, p=0.03).
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc')
| -rw-r--r-- | drivers/net/ethernet/sfc/rx.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index d5db045535d3..85ec07f5a674 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -412,7 +412,6 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, unsigned int n_frags, u8 *eh) { struct napi_struct *napi = &channel->napi_str; - gro_result_t gro_result; struct efx_nic *efx = channel->efx; struct sk_buff *skb; @@ -449,9 +448,7 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, skb_record_rx_queue(skb, channel->rx_queue.core_index); - gro_result = napi_gro_frags(napi); - if (gro_result != GRO_DROP) - channel->irq_mod_score += 2; + napi_gro_frags(napi); } /* Allocate and construct an SKB around page fragments */ |