netdev - Re: [PATCH net-next 1/4] tsnep: Throttle interrupts

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Message-ID: <8ede7314-c0a0-5160-5a03-aef9ddd620f3@engleder-embedded.com>
Date:   Sat, 19 Nov 2022 21:46:33 +0100
From:   Gerhard Engleder <gerhard@...leder-embedded.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com
Subject: Re: [PATCH net-next 1/4] tsnep: Throttle interrupts

On 19.11.22 02:24, Jakub Kicinski wrote:
> On Thu, 17 Nov 2022 21:14:37 +0100 Gerhard Engleder wrote:
>> Without interrupt throttling, iperf server mode generates a CPU load of
>> 100% (A53 1.2GHz). Also the throughput suffers with less than 900Mbit/s
>> on a 1Gbit/s link. The reason is a high interrupt load with interrupts
>> every ~20us.
>>
>> Reduce interrupt load by throttling of interrupts. Interrupt delay is
>> configured statically to 64us. For iperf server mode the CPU load is
>> significantly reduced to ~20% and the throughput reaches the maximum of
>> 941MBit/s. Interrupts are generated every ~140us.
> 
> User should be able to control these settings, please implement
> ethtool::get_coalesce / set_coalesce.

I will implement it.