linux-kernel - Re: [PATCH net-next] net: cadence: macb: Enable software IRQ coalescing by default

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Message-ID: <20240904162652.GB4792@kernel.org>
Date: Wed, 4 Sep 2024 17:26:52 +0100
From: Simon Horman <horms@...nel.org>
To: Sean Anderson <sean.anderson@...ux.dev>
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: cadence: macb: Enable software IRQ
 coalescing by default

On Tue, Sep 03, 2024 at 02:49:12PM -0400, Sean Anderson wrote:
> 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@...ux.dev>

Nice performance improvement :)

Reviewed-by: Simon Horman <horms@...nel.org>