From owner-freebsd-net@freebsd.org  Mon Jun 29 17:29:14 2015
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References: <20150629151750.GD1647@zxy.spb.ru> <55917B43.70904@FreeBSD.org>
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Date: Mon, 29 Jun 2015 10:29:14 -0700
Message-ID: <CAJ-Vmo=OY3rjTR+c-WMT2k7_gNNrY-bBEKB=+AhnZ6t5aa1Jzw@mail.gmail.com>
Subject: Re: netmap custom RSS and custom packet info
From: Adrian Chadd <adrian.chadd@gmail.com>
To: Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc: Navdeep Parhar <np@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org>
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Hi,

Turns out there are a class of symmetric RSS Toeplitz keys. Use google
to find the paper. :)


-a


On 29 June 2015 at 10:19, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:
> On Mon, Jun 29, 2015 at 10:07:15AM -0700, Navdeep Parhar wrote:
>
>> On 06/29/2015 08:17, Slawa Olhovchenkov wrote:
>> ...
>> > b) custom RSS. Modern NIC have RSS poorly interoperable with packet
>> > analysing: packets from same flow, but different direction placed in
>> > different queue, ...
>>
>> This is default behavior because the default hash (Toeplitz) is not
>> symmetrical.  There are modern NICs that do support other, symmetrical
>> hashes.
>
> Anyway this is still hardware-depended.
> I am don't see symmetrical hashes for 1G/10G Intel cards.
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