diff options
| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2021-08-06 01:55:32 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-08-06 13:08:57 +0300 |
| commit | 3bacbe04251b7bc5049a8951563d3a9a9b854dc1 (patch) | |
| tree | 3e7f481ec700f38faf250f1647d8f80fce33bd6e | |
| parent | 47bfc4d128dedd9e828e33b70b87b591a6d59edf (diff) | |
| download | linux-3bacbe04251b7bc5049a8951563d3a9a9b854dc1.tar.xz | |
net: ethernet: ti: am65-cpsw: use napi_complete_done() in TX completion
This patch enables support for hard irqs deferral feature from Eric Dumazet
[1] for TI K3 CPSW driver by using napi_complete_done() in TX completion
path.
Depending on gro_flush_timeout and napi_defer_hard_irqs at gives up to 30%
CPU utilization reduction:
gro_flush_timeout=50000
napi_defer_hard_irqs=2
netperf -l 10 -H 192.168.1.1 -t UDP_STREAM -c -C -- -m 1470
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.1.1 () port 0 AF_INET
Socket Message Elapsed Messages CPU Service
Size Size Time Okay Errors Throughput Util Demand
bytes bytes secs # # 10^6bits/sec % SS us/KB
before:
212992 1470 10.00 809632 0 952.0 42.98 14.792
212992 10.00 809630 952.0 50.66 8.719
after:
212992 1470 10.00 813686 0 956.8 32.14 11.009
212992 10.00 813686 956.8 50.05 8.570
[1] https://lore.kernel.org/netdev/20200422161329.56026-1-edumazet@google.com/
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/ti/am65-cpsw-nuss.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 329b908b4033..588e7df0b1cc 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -1086,13 +1086,13 @@ static int am65_cpsw_nuss_tx_poll(struct napi_struct *napi_tx, int budget) else num_tx = am65_cpsw_nuss_tx_compl_packets(tx_chn->common, tx_chn->id, budget); - num_tx = min(num_tx, budget); - if (num_tx < budget) { - napi_complete(napi_tx); + if (num_tx >= budget) + return budget; + + if (napi_complete_done(napi_tx, num_tx)) enable_irq(tx_chn->irq); - } - return num_tx; + return 0; } static irqreturn_t am65_cpsw_nuss_rx_irq(int irq, void *dev_id) |