netdev - Re: [PATCH net-next 0/9] ionic: Add support for Event Queues

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Message-ID: <4386aa68-d8c5-d619-4d38-cb3f4d441f56@pensando.io>
Date:   Sun, 16 Feb 2020 22:55:22 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/9] ionic: Add support for Event Queues

On 2/16/20 8:11 PM, David Miller wrote:
> From: Shannon Nelson <snelson@...sando.io>
> Date: Sun, 16 Feb 2020 15:11:49 -0800
>
>> This patchset adds a new EventQueue feature that can be used
>> for multiplexing the interrupts if we find that we can't get
>> enough from the system to support our configuration.  We can
>> create a small number of EQs that use interrupts, and have
>> the TxRx queue pairs subscribe to event messages that come
>> through the EQs, selecting an EQ with (TxIndex % numEqs).
> How is a user going to be able to figure out how to direct
> traffic to specific cpus using multiqueue settings if you're
> going to have the mapping go through this custom muxing
> afterwards?

When using the EQ feature, the TxRx are assigned to the EventQueues in a 
straight round-robin, so the layout is predictable.  I suppose we could 
have a way to print out the TxRx -> EQ -> Irq mappings, but I'm not sure 
where we would put such a thing.

sln