netdev - Re: Improving OCTEON II 10G Ethernet performance

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Message-ID: <20160825211852.GG12169@raspberrypi.musicnaut.iki.fi>
Date:   Fri, 26 Aug 2016 00:18:52 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     David Daney <ddaney@...iumnetworks.com>
Cc:     Ed Swierk <eswierk@...portsystems.com>,
        linux-mips <linux-mips@...ux-mips.org>,
        driverdev-devel <devel@...verdev.osuosl.org>,
        netdev <netdev@...r.kernel.org>,
        Aaro Koskinen <aaro.koskinen@...ia.com>
Subject: Re: Improving OCTEON II 10G Ethernet performance

Hi,

On Thu, Aug 25, 2016 at 01:11:45PM -0700, David Daney wrote:
> On 08/25/2016 11:22 AM, Aaro Koskinen wrote:
> >On Thu, Aug 25, 2016 at 09:50:15AM -0700, David Daney wrote:
> >>Ideally we would configure the packet classifiers on the RX side to create
> >>multiple RX queues based on a hash of the TCP 5-tuple, and handle each queue
> >>with a single NAPI instance.  That should result in better performance while
> >>maintaining packet ordering.
> >
> >Would this need anything else than reprogramming CVMX_PIP_PRT_TAGX, and
> >eliminating the global pow_receive_group and creating multiple NAPI instances
> >and registering IRQ handlers?
> 
> That is essentially how it works.  Set the tag generation parameters, and
> use the low order bits of the tag to select which POW/SSO group is assigned.
> The SSO group corresponds to an "rx queue"

OK, I will try to experiment with this. Even though my home routers are
2-core only I could still create more queues and verify that the traffic
gets distributed by checking the counters...

> >In the Yocto tree, the CVMX_PIP_PRT_TAGX register values are actually
> >documented:
> >
> >http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/tree/arch/mips/include/asm/octeon/cvmx-pip-defs.h?h=apaliwal/octeon#n3737
> 
> Wow, I didn't realize that documentation was made public.

Also D-Link and Qbiquity GPL source offerings for their products usually
include documentation for register fields. Only in mainline kernel they
are missing.

A.