Improving OCTEON II 10G Ethernet performance
David Daney
ddaney at caviumnetworks.com
Thu Aug 25 20:11:45 UTC 2016
On 08/25/2016 11:22 AM, Aaro Koskinen wrote:
> Hi,
>
> 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"
> 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.
>
> A.
>
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