netdev - Re: Setting RPS affinities from network driver

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Message-ID: <CA+sq2CeEAsSg-x+yX4kcougRZkOV3J6_eNwhVpzGEnr4EiF5rA@mail.gmail.com>
Date:	Tue, 24 Feb 2015 15:42:03 +0530
From:	Sunil Kovvuri <sunil.kovvuri@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Tom Herbert <therbert@...gle.com>, jonathon.reinhart@...il.com,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: Setting RPS affinities from network driver

Thanks for the valuable information.

Just to give more info on why i want think it is better to have this
config from driver,
- The SOC i am working on has multiple cores and has on-board ethernet
interface which supports upto 40Gbps.
- It is highly difficult to achieve any meaningful performance with
default RPS config.
- So currently i am setting RPS config such that the CPU which takes
high amount of interrupts/packets from receive queue doesn't do the
processing as well.
- This is improving network performance with single flow.

So thought if its possible to do this from driver itself instead
relying on user space scripts. As you guys have pointed i will try to
implement a generic API
instead of exporting 'rps_needed'. Will try to submit this very soon.

Thanks,
Sunil.


On Tue, Feb 24, 2015 at 8:44 AM, David Miller <davem@...emloft.net> wrote:
> From: Tom Herbert <therbert@...gle.com>
> Date: Fri, 20 Feb 2015 15:05:11 -0800
>
>>> Note that this argument is different from RSS where we're dealing with
>>> actual hardware queues, so the driver of course has a say in the
>>> configuration.
>>
>> Assuming that all queues are equal and we have a standard way to
>> influence the indirection table, even RSS configuration really isn't
>> driver specific configuration. We just need to know how many queues
>> are available.
>
> Agreed.
>
> If drivers start doing this, fine, but they must do it with a common
> piece of infrastructure that each and every driver can (easily) plug
> into and make use of.
>
> Even better would be something that was so generic that the driver's
> don't actualy implement any part of it other than responding to what
> the generic networking core asks it to do.
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