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Date: Mon, 29 Jun 2015 20:34:02 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Adrian Chadd <adrian.chadd@gmail.com>
Cc: Navdeep Parhar <np@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org>
Subject: Re: netmap custom RSS and custom packet info
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On Mon, Jun 29, 2015 at 10:29:14AM -0700, Adrian Chadd wrote:

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

How this interopperate with PPPoE encapsulation?
With GRE/GTP/MPLS encapsulation?

> 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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