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net: cadence: macb: Enable software IRQ coalescing by default

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This NIC doesn't have hardware IRQ coalescing. Under high load,
interrupts can adversely affect performance. To mitigate this, enable
software IRQ coalescing by default. On my system this increases receive
throughput with iperf3 from 853 MBit/sec to 934 MBit/s, decreases
interrupts from 69489/sec to 2016/sec, and decreases CPU utilization
from 27% (4x Cortex-A53) to 14%. Latency is not affected (as far as I
can tell).

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240903184912.4151926-1-sean.anderson@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sean Anderson 2024-09-03 14:49:12 -04:00 committed by Jakub Kicinski
parent 569bf6d481
commit d57f7b4594
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/cadence/macb_main.c
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@ -4184,6 +4184,8 @@ static int macb_init(struct platform_device *pdev)
dev->ethtool_ops = &macb_ethtool_ops;
}
netdev_sw_irq_coalesce_default_on(dev);
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
/* Set features */